55905816 has 64 divisors (see below), whose sum is σ = 144816480. Its totient is φ = 17971200.

The previous prime is 55905791. The next prime is 55905821. The reversal of 55905816 is 61850955.

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 15 ways as a sum of consecutive naturals, for example, 139216 + ... + 139616.

Almost surely, 2^55905816 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 55905816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72408240).

55905816 is an abundant number, since it is smaller than the sum of its proper divisors (88910664).

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

55905816 is a wasteful number, since it uses less digits than its factorization.

55905816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 55905816 is about 7477.0191921647. The cubic root of 55905816 is about 382.3716310660.

The spelling of 55905816 in words is "fifty-five million, nine hundred five thousand, eight hundred sixteen".