639054654 has 16 divisors (see below), whose sum is σ = 1460696448. Its totient is φ = 182587032.

The previous prime is 639054631. The next prime is 639054671. The reversal of 639054654 is 456450936.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15215587 = 639054654 / (6 + 3 + 9 + 0 + 5 + 4 + 6 + 5 + 4).

It is a congruent number.

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, 7607752 + ... + 7607835.

It is an arithmetic number, because the mean of its divisors is an integer number (91293528).

Almost surely, 2^639054654 is an apocalyptic number.

639054654 is an abundant number, since it is smaller than the sum of its proper divisors (821641794).

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

639054654 is a wasteful number, since it uses less digits than its factorization.

639054654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15215599.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 639054654 is about 25279.5303358270. The cubic root of 639054654 is about 861.3493572964.

The spelling of 639054654 in words is "six hundred thirty-nine million, fifty-four thousand, six hundred fifty-four".