571138638 has 32 divisors (see below), whose sum is σ = 1318394880. Its totient is φ = 161565600.

The previous prime is 571138627. The next prime is 571138639. The reversal of 571138638 is 836831175.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 571138638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (571138639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63078 + ... + 71561.

It is an arithmetic number, because the mean of its divisors is an integer number (41199840).

Almost surely, 2^571138638 is an apocalyptic number.

571138638 is an abundant number, since it is smaller than the sum of its proper divisors (747256242).

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

571138638 is a wasteful number, since it uses less digits than its factorization.

571138638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134752.

The product of its digits is 120960, while the sum is 42.

The square root of 571138638 is about 23898.5070244984. The cubic root of 571138638 is about 829.6861628594.

The spelling of 571138638 in words is "five hundred seventy-one million, one hundred thirty-eight thousand, six hundred thirty-eight".