55597776 has 80 divisors (see below), whose sum is σ = 156031680. Its totient is φ = 16957440.

The previous prime is 55597741. The next prime is 55597777. The reversal of 55597776 is 67779555.

It is a super-2 number, since 2×55597776² = 6182225392292352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55597777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86416 + ... + 87056.

It is an arithmetic number, because the mean of its divisors is an integer number (1950396).

Almost surely, 2^55597776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55597776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78015840).

55597776 is an abundant number, since it is smaller than the sum of its proper divisors (100433904).

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

55597776 is a wasteful number, since it uses less digits than its factorization.

55597776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 798 counting only the distinct ones).

The product of its digits is 2315250, while the sum is 51.

The square root of 55597776 is about 7456.3916206165. The cubic root of 55597776 is about 381.6680503966.

The spelling of 55597776 in words is "fifty-five million, five hundred ninety-seven thousand, seven hundred seventy-six".