55810812 has 12 divisors (see below), whose sum is σ = 130225256. Its totient is φ = 18603600.

The previous prime is 55810789. The next prime is 55810823. The reversal of 55810812 is 21801855.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×55810812² = 6229693472198688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 55810812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2325439 + ... + 2325462.

Almost surely, 2^55810812 is an apocalyptic number.

It is an amenable number.

55810812 is an abundant number, since it is smaller than the sum of its proper divisors (74414444).

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

55810812 is a wasteful number, since it uses less digits than its factorization.

55810812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650908 (or 4650906 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 55810812 is about 7470.6634243553. The cubic root of 55810812 is about 382.1549128190.

The spelling of 55810812 in words is "fifty-five million, eight hundred ten thousand, eight hundred twelve".