640074654 has 12 divisors (see below), whose sum is σ = 1386828456. Its totient is φ = 213358212.

The previous prime is 640074653. The next prime is 640074661. The reversal of 640074654 is 456470046.

640074654 is a `hidden beast` number, since 640 + 0 + 7 + 4 + 6 + 5 + 4 = 666.

640074654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640074653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17779834 + ... + 17779869.

It is an arithmetic number, because the mean of its divisors is an integer number (115569038).

Almost surely, 2^640074654 is an apocalyptic number.

640074654 is an abundant number, since it is smaller than the sum of its proper divisors (746753802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640074654 is a wasteful number, since it uses less digits than its factorization.

640074654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35559711 (or 35559708 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 640074654 is about 25299.6967175498. The cubic root of 640074654 is about 861.8073824532.

The spelling of 640074654 in words is "six hundred forty million, seventy-four thousand, six hundred fifty-four".