55312520 has 32 divisors (see below), whose sum is σ = 126316800. Its totient is φ = 21793728.

The previous prime is 55312519. The next prime is 55312529. The reversal of 55312520 is 2521355.

It is not an unprimeable number, because it can be changed into a prime (55312529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7640 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (3947400).

Almost surely, 2^55312520 is an apocalyptic number.

It is an amenable number.

55312520 is an abundant number, since it is smaller than the sum of its proper divisors (71004280).

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

55312520 is a wasteful number, since it uses less digits than its factorization.

55312520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20717 (or 20713 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55312520 is about 7437.2387349069. The cubic root of 55312520 is about 381.0141883148.

Adding to 55312520 its reverse (2521355), we get a palindrome (57833875).

The spelling of 55312520 in words is "fifty-five million, three hundred twelve thousand, five hundred twenty".