55540428 has 24 divisors (see below), whose sum is σ = 137218032. Its totient is φ = 17424384.

The previous prime is 55540427. The next prime is 55540451. The reversal of 55540428 is 82404555.

It is not an unprimeable number, because it can be changed into a prime (55540427) 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, 135925 + ... + 136332.

It is an arithmetic number, because the mean of its divisors is an integer number (5717418).

Almost surely, 2^55540428 is an apocalyptic number.

It is an amenable number.

55540428 is an abundant number, since it is smaller than the sum of its proper divisors (81677604).

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

55540428 is a wasteful number, since it uses less digits than its factorization.

55540428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272281 (or 272279 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 33.

The square root of 55540428 is about 7452.5450686326. The cubic root of 55540428 is about 381.5367775839.

The spelling of 55540428 in words is "fifty-five million, five hundred forty thousand, four hundred twenty-eight".