64493856 has 72 divisors (see below), whose sum is σ = 209611584. Its totient is φ = 18426240.

The previous prime is 64493843. The next prime is 64493867. The reversal of 64493856 is 65839446.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13980 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (2911272).

Almost surely, 2^64493856 is an apocalyptic number.

It is an amenable number.

64493856 is an abundant number, since it is smaller than the sum of its proper divisors (145117728).

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

64493856 is a wasteful number, since it uses less digits than its factorization.

64493856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32014 (or 32003 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 64493856 is about 8030.8066842628. The cubic root of 64493856 is about 401.0262315371.

The spelling of 64493856 in words is "sixty-four million, four hundred ninety-three thousand, eight hundred fifty-six".