55312812 has 18 divisors (see below), whose sum is σ = 139818588. Its totient is φ = 18437592.

The previous prime is 55312811. The next prime is 55312837. The reversal of 55312812 is 21821355.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (55312811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 768198 + ... + 768269.

Almost surely, 2^55312812 is an apocalyptic number.

It is an amenable number.

55312812 is an abundant number, since it is smaller than the sum of its proper divisors (84505776).

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

55312812 is a wasteful number, since it uses less digits than its factorization.

55312812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536477 (or 1536472 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 55312812 is about 7437.2583658227. The cubic root of 55312812 is about 381.0148587836.

The spelling of 55312812 in words is "fifty-five million, three hundred twelve thousand, eight hundred twelve".