638325654 has 16 divisors (see below), whose sum is σ = 1279618560. Its totient is φ = 212280680.

The previous prime is 638325643. The next prime is 638325689. The reversal of 638325654 is 456523836.

It is an alternating number because its digits alternate between even and odd.

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, 120834 + ... + 126005.

It is an arithmetic number, because the mean of its divisors is an integer number (79976160).

Almost surely, 2^638325654 is an apocalyptic number.

638325654 is an abundant number, since it is smaller than the sum of its proper divisors (641292906).

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

638325654 is a wasteful number, since it uses less digits than its factorization.

638325654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247275.

The product of its digits is 518400, while the sum is 42.

The square root of 638325654 is about 25265.1074408956. The cubic root of 638325654 is about 861.0217052995.

The spelling of 638325654 in words is "six hundred thirty-eight million, three hundred twenty-five thousand, six hundred fifty-four".