55121478 has 32 divisors (see below), whose sum is σ = 116142336. Its totient is φ = 17406048.

The previous prime is 55121477. The next prime is 55121483. The reversal of 55121478 is 87412155.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12900 + ... + 16632.

It is an arithmetic number, because the mean of its divisors is an integer number (3629448).

Almost surely, 2^55121478 is an apocalyptic number.

55121478 is an abundant number, since it is smaller than the sum of its proper divisors (61020858).

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

55121478 is a wasteful number, since it uses less digits than its factorization.

55121478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868.

The product of its digits is 11200, while the sum is 33.

The square root of 55121478 is about 7424.3840148527. The cubic root of 55121478 is about 380.5750250796.

It can be divided in two parts, 5512147 and 8, that added together give a palindrome (5512155).

The spelling of 55121478 in words is "fifty-five million, one hundred twenty-one thousand, four hundred seventy-eight".