640054178 has 16 divisors (see below), whose sum is σ = 1032117120. Its totient is φ = 296732016.

The previous prime is 640054171. The next prime is 640054187. The reversal of 640054178 is 871450046.

It is not an unprimeable number, because it can be changed into a prime (640054171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177401 + ... + 180972.

It is an arithmetic number, because the mean of its divisors is an integer number (64507320).

Almost surely, 2^640054178 is an apocalyptic number.

640054178 is a deficient number, since it is larger than the sum of its proper divisors (392062942).

640054178 is a wasteful number, since it uses less digits than its factorization.

640054178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358441.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 640054178 is about 25299.2920454308. The cubic root of 640054178 is about 861.7981926105.

The spelling of 640054178 in words is "six hundred forty million, fifty-four thousand, one hundred seventy-eight".