55402920 has 128 divisors (see below), whose sum is σ = 189129600. Its totient is φ = 14418432.

The previous prime is 55402873. The next prime is 55402927. The reversal of 55402920 is 2920455.

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 (55402927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45844 + ... + 47036.

It is an arithmetic number, because the mean of its divisors is an integer number (1477575).

Almost surely, 2^55402920 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 55402920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94564800).

55402920 is an abundant number, since it is smaller than the sum of its proper divisors (133726680).

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

55402920 is a wasteful number, since it uses less digits than its factorization.

55402920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 55402920 is about 7443.3137781502. The cubic root of 55402920 is about 381.2216454770.

The spelling of 55402920 in words is "fifty-five million, four hundred two thousand, nine hundred twenty".