64640316 has 24 divisors (see below), whose sum is σ = 162429904. Its totient is φ = 19889280.

The previous prime is 64640311. The next prime is 64640339. The reversal of 64640316 is 61304646.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207025 + ... + 207336.

Almost surely, 2^64640316 is an apocalyptic number.

It is an amenable number.

64640316 is an abundant number, since it is smaller than the sum of its proper divisors (97789588).

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

64640316 is a wasteful number, since it uses less digits than its factorization.

64640316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414381 (or 414379 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64640316 is about 8039.9201488572. The cubic root of 64640316 is about 401.3295673965.

The spelling of 64640316 in words is "sixty-four million, six hundred forty thousand, three hundred sixteen".