64427865 has 16 divisors (see below), whose sum is σ = 103612608. Its totient is φ = 34185536.

The previous prime is 64427863. The next prime is 64427887. The reversal of 64427865 is 56872446.

It is a cyclic number.

It is not a de Polignac number, because 64427865 - 2¹ = 64427863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64427861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7947 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (6475788).

Almost surely, 2^64427865 is an apocalyptic number.

It is an amenable number.

64427865 is a deficient number, since it is larger than the sum of its proper divisors (39184743).

64427865 is a wasteful number, since it uses less digits than its factorization.

64427865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22008.

The product of its digits is 322560, while the sum is 42.

The square root of 64427865 is about 8026.6970168308. The cubic root of 64427865 is about 400.8894063418.

The spelling of 64427865 in words is "sixty-four million, four hundred twenty-seven thousand, eight hundred sixty-five".