638260136 has 16 divisors (see below), whose sum is σ = 1207923840. Its totient is φ = 316147120.

The previous prime is 638260127. The next prime is 638260153. The reversal of 638260136 is 631062836.

It is a junction number, because it is equal to n+sod(n) for n = 638260096 and 638260105.

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, 371960 + ... + 373671.

It is an arithmetic number, because the mean of its divisors is an integer number (75495240).

Almost surely, 2^638260136 is an apocalyptic number.

It is an amenable number.

638260136 is a deficient number, since it is larger than the sum of its proper divisors (569663704).

638260136 is a wasteful number, since it uses less digits than its factorization.

638260136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745744 (or 745740 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 638260136 is about 25263.8107972649. The cubic root of 638260136 is about 860.9922457544.

The spelling of 638260136 in words is "six hundred thirty-eight million, two hundred sixty thousand, one hundred thirty-six".