52172818 has 4 divisors (see below), whose sum is σ = 78259230. Its totient is φ = 26086408.

The previous prime is 52172807. The next prime is 52172831. The reversal of 52172818 is 81827125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 52171729 + 1089 = 7223^2 + 33^2 .

It is a super-2 number, since 2×52172818² = 5444005876122248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13043203 + ... + 13043206.

Almost surely, 2^52172818 is an apocalyptic number.

52172818 is a deficient number, since it is larger than the sum of its proper divisors (26086412).

52172818 is a wasteful number, since it uses less digits than its factorization.

52172818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26086411.

The product of its digits is 8960, while the sum is 34.

The square root of 52172818 is about 7223.0753837960. The cubic root of 52172818 is about 373.6641489148.

The spelling of 52172818 in words is "fifty-two million, one hundred seventy-two thousand, eight hundred eighteen".