57026872809 has 9 divisors (see below), whose sum is σ = 82373184439. Its totient is φ = 38017437600.

The previous prime is 57026872769. The next prime is 57026872813. The reversal of 57026872809 is 90827862075.

It is a happy number.

The square root of 57026872809 is 238803.

It is a perfect power (a square), and thus also a powerful number.

57026872809 is a `hidden beast` number, since 570 + 2 + 68 + 7 + 2 + 8 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1432809 + 57025440000 = 1197^2 + 238800^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 57026872809 - 2¹⁵ = 57026840041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57026872109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 676609 + ... + 756209.

Almost surely, 2^57026872809 is an apocalyptic number.

57026872809 is the 238803-rd square number.

57026872809 is the 119402-nd centered octagonal number.

It is an amenable number.

57026872809 is a deficient number, since it is larger than the sum of its proper divisors (25346311630).

57026872809 is an frugal number, since it uses more digits than its factorization.

57026872809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159208 (or 79604 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 57026872809 in words is "fifty-seven billion, twenty-six million, eight hundred seventy-two thousand, eight hundred nine".