64963640 has 32 divisors (see below), whose sum is σ = 167050080. Its totient is φ = 22273152.

The previous prime is 64963609. The next prime is 64963643. The reversal of 64963640 is 4636946.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64963594 and 64963603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64963643) 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, 115727 + ... + 116286.

It is an arithmetic number, because the mean of its divisors is an integer number (5220315).

Almost surely, 2^64963640 is an apocalyptic number.

It is an amenable number.

64963640 is an abundant number, since it is smaller than the sum of its proper divisors (102086440).

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

64963640 is a wasteful number, since it uses less digits than its factorization.

64963640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232031 (or 232027 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 64963640 is about 8060.0024813892. The cubic root of 64963640 is about 401.9975908043.

The spelling of 64963640 in words is "sixty-four million, nine hundred sixty-three thousand, six hundred forty".