64031940 has 144 divisors (see below), whose sum is σ = 224864640. Its totient is φ = 14446080.

The previous prime is 64031939. The next prime is 64031951. The reversal of 64031940 is 4913046.

64031940 is a `hidden beast` number, since 640 + 3 + 19 + 4 + 0 = 666.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 111855 + ... + 112425.

It is an arithmetic number, because the mean of its divisors is an integer number (1561560).

Almost surely, 2^64031940 is an apocalyptic number.

64031940 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 64031940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112432320).

64031940 is an abundant number, since it is smaller than the sum of its proper divisors (160832700).

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

64031940 is a wasteful number, since it uses less digits than its factorization.

64031940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 64031940 is about 8001.9960009988. The cubic root of 64031940 is about 400.0665306003.

Adding to 64031940 its reverse (4913046), we get a palindrome (68944986).

The spelling of 64031940 in words is "sixty-four million, thirty-one thousand, nine hundred forty".