55257420 has 24 divisors (see below), whose sum is σ = 154720944. Its totient is φ = 14735296.

The previous prime is 55257409. The next prime is 55257427. The reversal of 55257420 is 2475255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (55257427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460419 + ... + 460538.

It is an arithmetic number, because the mean of its divisors is an integer number (6446706).

Almost surely, 2^55257420 is an apocalyptic number.

It is an amenable number.

55257420 is an abundant number, since it is smaller than the sum of its proper divisors (99463524).

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

55257420 is a wasteful number, since it uses less digits than its factorization.

55257420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920969 (or 920967 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 30.

The square root of 55257420 is about 7433.5334801156. The cubic root of 55257420 is about 380.8876295254.

The spelling of 55257420 in words is "fifty-five million, two hundred fifty-seven thousand, four hundred twenty".