640885054 has 8 divisors (see below), whose sum is σ = 961586928. Its totient is φ = 320356080.

The previous prime is 640885043. The next prime is 640885061. The reversal of 640885054 is 450588046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 640884998 and 640885016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33522 + ... + 49045.

It is an arithmetic number, because the mean of its divisors is an integer number (120198366).

Almost surely, 2^640885054 is an apocalyptic number.

640885054 is a deficient number, since it is larger than the sum of its proper divisors (320701874).

640885054 is a wasteful number, since it uses less digits than its factorization.

640885054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86450.

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 640885054 is about 25315.7076535498. The cubic root of 640885054 is about 862.1709411689.

The spelling of 640885054 in words is "six hundred forty million, eight hundred eighty-five thousand, fifty-four".