64002640 has 160 divisors (see below), whose sum is σ = 174988800. Its totient is φ = 21565440.

The previous prime is 64002613. The next prime is 64002643. The reversal of 64002640 is 4620046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64002643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 810121 + ... + 810199.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^64002640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64002640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87494400).

64002640 is an abundant number, since it is smaller than the sum of its proper divisors (110986160).

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

64002640 is a wasteful number, since it uses less digits than its factorization.

64002640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 64002640 is about 8000.1649982985. The cubic root of 64002640 is about 400.0054999244.

Adding to 64002640 its reverse (4620046), we get a palindrome (68622686).

The spelling of 64002640 in words is "sixty-four million, two thousand, six hundred forty".