55785624 has 32 divisors (see below), whose sum is σ = 140824320. Its totient is φ = 18413856.

The previous prime is 55785617. The next prime is 55785629. The reversal of 55785624 is 42658755.

It is a super-2 number, since 2×55785624² = 6224071690138752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55785629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8812 + ... + 13755.

It is an arithmetic number, because the mean of its divisors is an integer number (4400760).

Almost surely, 2^55785624 is an apocalyptic number.

It is an amenable number.

55785624 is an abundant number, since it is smaller than the sum of its proper divisors (85038696).

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

55785624 is a wasteful number, since it uses less digits than its factorization.

55785624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22679 (or 22675 counting only the distinct ones).

The product of its digits is 336000, while the sum is 42.

The square root of 55785624 is about 7468.9774400516. The cubic root of 55785624 is about 382.0974140057.

The spelling of 55785624 in words is "fifty-five million, seven hundred eighty-five thousand, six hundred twenty-four".