55819816 has 16 divisors (see below), whose sum is σ = 112713300. Its totient is φ = 25762944.

The previous prime is 55819811. The next prime is 55819831. The reversal of 55819816 is 61891855.

It can be written as a sum of positive squares in 2 ways, for example, as 53728900 + 2090916 = 7330^2 + 1446^2 .

It is not an unprimeable number, because it can be changed into a prime (55819811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268261 + ... + 268468.

Almost surely, 2^55819816 is an apocalyptic number.

It is an amenable number.

55819816 is an abundant number, since it is smaller than the sum of its proper divisors (56893484).

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

55819816 is a wasteful number, since it uses less digits than its factorization.

55819816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536748 (or 536744 counting only the distinct ones).

The product of its digits is 86400, while the sum is 43.

The square root of 55819816 is about 7471.2660239079. The cubic root of 55819816 is about 382.1754628265.

The spelling of 55819816 in words is "fifty-five million, eight hundred nineteen thousand, eight hundred sixteen".