64640508 has 24 divisors (see below), whose sum is σ = 158766720. Its totient is φ = 20412720.

The previous prime is 64640503. The next prime is 64640539. The reversal of 64640508 is 80504646.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141528 + ... + 141983.

It is an arithmetic number, because the mean of its divisors is an integer number (6615280).

Almost surely, 2^64640508 is an apocalyptic number.

It is an amenable number.

64640508 is an abundant number, since it is smaller than the sum of its proper divisors (94126212).

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

64640508 is a wasteful number, since it uses less digits than its factorization.

64640508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283537 (or 283535 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 64640508 is about 8039.9320892654. The cubic root of 64640508 is about 401.3299647501.

The spelling of 64640508 in words is "sixty-four million, six hundred forty thousand, five hundred eight".