640100770 has 16 divisors (see below), whose sum is σ = 1153880640. Its totient is φ = 255662704.

The previous prime is 640100767. The next prime is 640100807. The reversal of 640100770 is 77001046.

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 7 ways as a sum of consecutive naturals, for example, 40030 + ... + 53689.

It is an arithmetic number, because the mean of its divisors is an integer number (72117540).

Almost surely, 2^640100770 is an apocalyptic number.

640100770 is a deficient number, since it is larger than the sum of its proper divisors (513779870).

640100770 is a wasteful number, since it uses less digits than its factorization.

640100770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94409.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 640100770 is about 25300.2128449545. The cubic root of 640100770 is about 861.8191033024.

The spelling of 640100770 in words is "six hundred forty million, one hundred thousand, seven hundred seventy".