64547856 has 30 divisors (see below), whose sum is σ = 180644750. Its totient is φ = 21515904.

The previous prime is 64547851. The next prime is 64547887. The reversal of 64547856 is 65874546.

It can be written as a sum of positive squares in only one way, i.e., 64256256 + 291600 = 8016^2 + 540^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64547851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223981 + ... + 224268.

Almost surely, 2^64547856 is an apocalyptic number.

It is an amenable number.

64547856 is an abundant number, since it is smaller than the sum of its proper divisors (116096894).

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

64547856 is a wasteful number, since it uses less digits than its factorization.

64547856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448263 (or 448254 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 64547856 is about 8034.1680340904. The cubic root of 64547856 is about 401.1381252725.

The spelling of 64547856 in words is "sixty-four million, five hundred forty-seven thousand, eight hundred fifty-six".