55212872 has 96 divisors (see below), whose sum is σ = 129971520. Its totient is φ = 21672960.

The previous prime is 55212823. The next prime is 55212877. The reversal of 55212872 is 27821255.

It is a happy number.

55212872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55212872² = 6096922468976768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55212877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330533 + ... + 330699.

It is an arithmetic number, because the mean of its divisors is an integer number (1353870).

Almost surely, 2^55212872 is an apocalyptic number.

55212872 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55212872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64985760).

55212872 is an abundant number, since it is smaller than the sum of its proper divisors (74758648).

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

55212872 is a wasteful number, since it uses less digits than its factorization.

55212872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 210 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 55212872 is about 7430.5364543887. The cubic root of 55212872 is about 380.7852460270.

The spelling of 55212872 in words is "fifty-five million, two hundred twelve thousand, eight hundred seventy-two".