640371123 has 32 divisors (see below), whose sum is σ = 1119211520. Its totient is φ = 354119040.

The previous prime is 640371101. The next prime is 640371143. The reversal of 640371123 is 321173046.

640371123 is a `hidden beast` number, since 640 + 3 + 7 + 1 + 12 + 3 = 666.

640371123 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 640371123 - 2¹² = 640367027 is a prime.

It is a super-2 number, since 2×640371123² = 820150350344562258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (640371143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48790 + ... + 60507.

It is an arithmetic number, because the mean of its divisors is an integer number (34975360).

Almost surely, 2^640371123 is an apocalyptic number.

640371123 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

640371123 is a deficient number, since it is larger than the sum of its proper divisors (478840397).

640371123 is a wasteful number, since it uses less digits than its factorization.

640371123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109344 (or 109338 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 640371123 is about 25305.5551806318. Note that the first 3 decimals coincide. The cubic root of 640371123 is about 861.9404188806.

The spelling of 640371123 in words is "six hundred forty million, three hundred seventy-one thousand, one hundred twenty-three".