55513444 has 24 divisors (see below), whose sum is σ = 115855488. Its totient is φ = 22756800.

The previous prime is 55513433. The next prime is 55513457. The reversal of 55513444 is 44431555.

It is a happy number.

It is a super-2 number, since 2×55513444² = 6163484929482272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 42457 + ... + 43744.

It is an arithmetic number, because the mean of its divisors is an integer number (4827312).

Almost surely, 2^55513444 is an apocalyptic number.

It is an amenable number.

55513444 is an abundant number, since it is smaller than the sum of its proper divisors (60342044).

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

55513444 is a wasteful number, since it uses less digits than its factorization.

55513444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86235 (or 86233 counting only the distinct ones).

The product of its digits is 24000, while the sum is 31.

The square root of 55513444 is about 7450.7344604408. The cubic root of 55513444 is about 381.4749784191.

Adding to 55513444 its reverse (44431555), we get a palindrome (99944999).

The spelling of 55513444 in words is "fifty-five million, five hundred thirteen thousand, four hundred forty-four".