638857059 has 32 divisors (see below), whose sum is σ = 937681920. Its totient is φ = 385224192.

The previous prime is 638857049. The next prime is 638857061. The reversal of 638857059 is 950758836.

It is not a de Polignac number, because 638857059 - 2¹⁷ = 638725987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (638857049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154582 + ... + 158660.

It is an arithmetic number, because the mean of its divisors is an integer number (29302560).

Almost surely, 2^638857059 is an apocalyptic number.

638857059 is a deficient number, since it is larger than the sum of its proper divisors (298824861).

638857059 is a wasteful number, since it uses less digits than its factorization.

638857059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The square root of 638857059 is about 25275.6218321133. The cubic root of 638857059 is about 861.2605720519.

The spelling of 638857059 in words is "six hundred thirty-eight million, eight hundred fifty-seven thousand, fifty-nine".