64891856 has 20 divisors (see below), whose sum is σ = 133124292. Its totient is φ = 30537216.

The previous prime is 64891847. The next prime is 64891891. The reversal of 64891856 is 65819846.

It can be written as a sum of positive squares in 2 ways, for example, as 25000000 + 39891856 = 5000^2 + 6316^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64891856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119015 + ... + 119558.

Almost surely, 2^64891856 is an apocalyptic number.

It is an amenable number.

64891856 is an abundant number, since it is smaller than the sum of its proper divisors (68232436).

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

64891856 is a wasteful number, since it uses less digits than its factorization.

64891856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238598 (or 238592 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 64891856 is about 8055.5481501882. The cubic root of 64891856 is about 401.8494688165.

The spelling of 64891856 in words is "sixty-four million, eight hundred ninety-one thousand, eight hundred fifty-six".