55121472 has 280 divisors, whose sum is σ = 196697600. Its totient is φ = 15240960.

The previous prime is 55121467. The next prime is 55121477. The reversal of 55121472 is 27412155.

55121472 is a `hidden beast` number, since 5 + 512 + 147 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (55121467) and next prime (55121477).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55121477) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1778097 + ... + 1778127.

Almost surely, 2^55121472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55121472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98348800).

55121472 is an abundant number, since it is smaller than the sum of its proper divisors (141576128).

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

55121472 is an equidigital number, since it uses as much as digits as its factorization.

55121472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 43 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 55121472 is about 7424.3836107787. The cubic root of 55121472 is about 380.5750112710.

The spelling of 55121472 in words is "fifty-five million, one hundred twenty-one thousand, four hundred seventy-two".