55921992 has 64 divisors (see below), whose sum is σ = 160389120. Its totient is φ = 15916608.

The previous prime is 55921981. The next prime is 55922003. The reversal of 55921992 is 29912955.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55921981) and next prime (55922003).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61203 + ... + 62109.

It is an arithmetic number, because the mean of its divisors is an integer number (2506080).

Almost surely, 2^55921992 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 55921992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80194560).

55921992 is an abundant number, since it is smaller than the sum of its proper divisors (104467128).

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

55921992 is a wasteful number, since it uses less digits than its factorization.

55921992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1286 counting only the distinct ones).

The product of its digits is 72900, while the sum is 42.

The square root of 55921992 is about 7478.1008284189. The cubic root of 55921992 is about 382.4085064604.

The spelling of 55921992 in words is "fifty-five million, nine hundred twenty-one thousand, nine hundred ninety-two".