55811530 has 16 divisors (see below), whose sum is σ = 101044584. Its totient is φ = 22194880.

The previous prime is 55811453. The next prime is 55811543. The reversal of 55811530 is 3511855.

It can be written as a sum of positive squares in 4 ways, for example, as 44715969 + 11095561 = 6687^2 + 3331^2 .

It is a super-2 number, since 2×55811530² = 6229853761881800, 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, 14401 + ... + 17860.

Almost surely, 2^55811530 is an apocalyptic number.

55811530 is a deficient number, since it is larger than the sum of its proper divisors (45233054).

55811530 is a wasteful number, since it uses less digits than its factorization.

55811530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32441.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 55811530 is about 7470.7114788352. The cubic root of 55811530 is about 382.1565516057.

The spelling of 55811530 in words is "fifty-five million, eight hundred eleven thousand, five hundred thirty".