55689816 has 128 divisors (see below), whose sum is σ = 175633920. Its totient is φ = 14321664.

The previous prime is 55689791. The next prime is 55689827. The reversal of 55689816 is 61898655.

It is a super-2 number, since 2×55689816² = 6202711212227712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 93616 + ... + 94208.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^55689816 is an apocalyptic number.

55689816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55689816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87816960).

55689816 is an abundant number, since it is smaller than the sum of its proper divisors (119944104).

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

55689816 is a wasteful number, since it uses less digits than its factorization.

55689816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 661 counting only the distinct ones).

The product of its digits is 518400, while the sum is 48.

The square root of 55689816 is about 7462.5609545249. The cubic root of 55689816 is about 381.8785465887.

The spelling of 55689816 in words is "fifty-five million, six hundred eighty-nine thousand, eight hundred sixteen".