640751055 has 32 divisors (see below), whose sum is σ = 1180237824. Its totient is φ = 290770176.

The previous prime is 640751009. The next prime is 640751099. The reversal of 640751055 is 550157046.

640751055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640751055 - 2¹⁷ = 640619983 is a prime.

It is a super-2 number, since 2×640751055² = 821123828967226050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7887 + ... + 36656.

It is an arithmetic number, because the mean of its divisors is an integer number (36882432).

Almost surely, 2^640751055 is an apocalyptic number.

640751055 is a deficient number, since it is larger than the sum of its proper divisors (539486769).

640751055 is a wasteful number, since it uses less digits than its factorization.

640751055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44695.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 640751055 is about 25313.0609567472. The cubic root of 640751055 is about 862.1108481793.

The spelling of 640751055 in words is "six hundred forty million, seven hundred fifty-one thousand, fifty-five".