55421982 has 96 divisors (see below), whose sum is σ = 155361024. Its totient is φ = 14385600.

The previous prime is 55421963. The next prime is 55421999. The reversal of 55421982 is 28912455.

55421982 is a `hidden beast` number, since 554 + 21 + 9 + 82 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36682 + ... + 38162.

It is an arithmetic number, because the mean of its divisors is an integer number (1618344).

Almost surely, 2^55421982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55421982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77680512).

55421982 is an abundant number, since it is smaller than the sum of its proper divisors (99939042).

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

55421982 is a wasteful number, since it uses less digits than its factorization.

55421982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516 (or 1504 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 55421982 is about 7444.5941460902. The cubic root of 55421982 is about 381.2653616671.

The spelling of 55421982 in words is "fifty-five million, four hundred twenty-one thousand, nine hundred eighty-two".