64271640 has 64 divisors (see below), whose sum is σ = 194146560. Its totient is φ = 17020800.

The previous prime is 64271633. The next prime is 64271651. The reversal of 64271640 is 4617246.

64271640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64271598 and 64271607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16347 + ... + 19893.

It is an arithmetic number, because the mean of its divisors is an integer number (3033540).

Almost surely, 2^64271640 is an apocalyptic number.

64271640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64271640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97073280).

64271640 is an abundant number, since it is smaller than the sum of its proper divisors (129874920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64271640 is a wasteful number, since it uses less digits than its factorization.

64271640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712 (or 3708 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 64271640 is about 8016.9595234104. The cubic root of 64271640 is about 400.5651178951.

Adding to 64271640 its reverse (4617246), we get a palindrome (68888886).

The spelling of 64271640 in words is "sixty-four million, two hundred seventy-one thousand, six hundred forty".