638770 has 16 divisors (see below), whose sum is σ = 1254528. Its totient is φ = 232240.

The previous prime is 638767. The next prime is 638801. The reversal of 638770 is 77836.

It is a super-2 number, since 2×638770² = 816054225800, which contains 22 as substring.

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, 2794 + ... + 3013.

It is an arithmetic number, because the mean of its divisors is an integer number (78408).

2⁶³⁸⁷⁷⁰ is an apocalyptic number.

638770 is a deficient number, since it is larger than the sum of its proper divisors (615758).

638770 is a wasteful number, since it uses less digits than its factorization.

638770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5825.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 638770 is about 799.2308802843. The cubic root of 638770 is about 86.1221448073.

The spelling of 638770 in words is "six hundred thirty-eight thousand, seven hundred seventy".