638646003 has 6 divisors (see below), whose sum is σ = 922488684. Its totient is φ = 425763996.

The previous prime is 638645999. The next prime is 638646007. The reversal of 638646003 is 300646836.

638646003 is a `hidden beast` number, since 6 + 3 + 8 + 646 + 0 + 0 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (638645999) and next prime (638646007).

It is not a de Polignac number, because 638646003 - 2² = 638645999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638646007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35480325 + ... + 35480342.

It is an arithmetic number, because the mean of its divisors is an integer number (153748114).

Almost surely, 2^638646003 is an apocalyptic number.

638646003 is a deficient number, since it is larger than the sum of its proper divisors (283842681).

638646003 is a wasteful number, since it uses less digits than its factorization.

638646003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70960673 (or 70960670 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 638646003 is about 25271.4463970704. The cubic root of 638646003 is about 861.1657181616.

The spelling of 638646003 in words is "six hundred thirty-eight million, six hundred forty-six thousand, three".