640078954 has 16 divisors (see below), whose sum is σ = 1011326400. Its totient is φ = 302992704.

The previous prime is 640078927. The next prime is 640078961. The reversal of 640078954 is 459870046.

It is a super-3 number, since 3×640078954³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640078954.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62787 + ... + 72265.

It is an arithmetic number, because the mean of its divisors is an integer number (63207900).

Almost surely, 2^640078954 is an apocalyptic number.

640078954 is a deficient number, since it is larger than the sum of its proper divisors (371247446).

640078954 is a wasteful number, since it uses less digits than its factorization.

640078954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11277.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 640078954 is about 25299.7816986629. The cubic root of 640078954 is about 861.8093123132.

The spelling of 640078954 in words is "six hundred forty million, seventy-eight thousand, nine hundred fifty-four".