64390887 has 12 divisors (see below), whose sum is σ = 101464584. Its totient is φ = 39024720.

The previous prime is 64390861. The next prime is 64390897. The reversal of 64390887 is 78809346.

It is a happy number.

It is not a de Polignac number, because 64390887 - 2¹⁹ = 63866599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64390897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325108 + ... + 325305.

It is an arithmetic number, because the mean of its divisors is an integer number (8455382).

Almost surely, 2^64390887 is an apocalyptic number.

64390887 is a deficient number, since it is larger than the sum of its proper divisors (37073697).

64390887 is a wasteful number, since it uses less digits than its factorization.

64390887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650430 (or 650427 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 64390887 is about 8024.3932480905. The cubic root of 64390887 is about 400.8126956130.

The spelling of 64390887 in words is "sixty-four million, three hundred ninety thousand, eight hundred eighty-seven".