64867640 has 32 divisors (see below), whose sum is σ = 146212560. Its totient is φ = 25900800.

The previous prime is 64867639. The next prime is 64867651. The reversal of 64867640 is 4676846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29375 + ... + 31505.

Almost surely, 2^64867640 is an apocalyptic number.

It is an amenable number.

64867640 is an abundant number, since it is smaller than the sum of its proper divisors (81344920).

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

64867640 is a wasteful number, since it uses less digits than its factorization.

64867640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903 (or 2899 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 64867640 is about 8054.0449464850. The cubic root of 64867640 is about 401.7994759101.

The spelling of 64867640 in words is "sixty-four million, eight hundred sixty-seven thousand, six hundred forty".