55819881 has 32 divisors (see below), whose sum is σ = 89936000. Its totient is φ = 34012224.

The previous prime is 55819859. The next prime is 55819889. The reversal of 55819881 is 18891855.

55819881 is a `hidden beast` number, since 558 + 1 + 98 + 8 + 1 = 666.

It is not a de Polignac number, because 55819881 - 2⁵ = 55819849 is a prime.

It is a super-2 number, since 2×55819881² = 6231718229708322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55819889) 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, 37530 + ... + 38988.

It is an arithmetic number, because the mean of its divisors is an integer number (2810500).

Almost surely, 2^55819881 is an apocalyptic number.

It is an amenable number.

55819881 is a deficient number, since it is larger than the sum of its proper divisors (34116119).

55819881 is a wasteful number, since it uses less digits than its factorization.

55819881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1584 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The square root of 55819881 is about 7471.2703739056. The cubic root of 55819881 is about 382.1756111692.

The spelling of 55819881 in words is "fifty-five million, eight hundred nineteen thousand, eight hundred eighty-one".