640104776 has 16 divisors (see below), whose sum is σ = 1209360240. Its totient is φ = 317608720.

The previous prime is 640104769. The next prime is 640104809. The reversal of 640104776 is 677401046.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304346 + ... + 306441.

It is an arithmetic number, because the mean of its divisors is an integer number (75585015).

Almost surely, 2^640104776 is an apocalyptic number.

It is an amenable number.

640104776 is a deficient number, since it is larger than the sum of its proper divisors (569255464).

640104776 is a wasteful number, since it uses less digits than its factorization.

640104776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610924 (or 610920 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 640104776 is about 25300.2920141251. The cubic root of 640104776 is about 861.8209011652.

It can be divided in two parts, 64010 and 4776, that added together give a palindrome (68786).

The spelling of 640104776 in words is "six hundred forty million, one hundred four thousand, seven hundred seventy-six".