638070 has 16 divisors (see below), whose sum is σ = 1531440. Its totient is φ = 170144.

The previous prime is 638063. The next prime is 638081. The reversal of 638070 is 70836.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 638070.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638070.

It is an unprimeable number.

638070 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10605 + ... + 10664.

It is an arithmetic number, because the mean of its divisors is an integer number (95715).

2⁶³⁸⁰⁷⁰ is an apocalyptic number.

638070 is an abundant number, since it is smaller than the sum of its proper divisors (893370).

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

638070 is a wasteful number, since it uses less digits than its factorization.

638070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21279.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 638070 is about 798.7928392268. The cubic root of 638070 is about 86.0906741495.

The spelling of 638070 in words is "six hundred thirty-eight thousand, seventy".