64840388 has 24 divisors (see below), whose sum is σ = 122226720. Its totient is φ = 29998080.

The previous prime is 64840387. The next prime is 64840409. The reversal of 64840388 is 88304846.

It is not an unprimeable number, because it can be changed into a prime (64840387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6653 + ... + 13188.

It is an arithmetic number, because the mean of its divisors is an integer number (5092780).

Almost surely, 2^64840388 is an apocalyptic number.

It is an amenable number.

64840388 is a deficient number, since it is larger than the sum of its proper divisors (57386332).

64840388 is a wasteful number, since it uses less digits than its factorization.

64840388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19907 (or 19905 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 64840388 is about 8052.3529480519. The cubic root of 64840388 is about 401.7432004283.

The spelling of 64840388 in words is "sixty-four million, eight hundred forty thousand, three hundred eighty-eight".