55421564 has 24 divisors (see below), whose sum is σ = 112030128. Its totient is φ = 23709440.

The previous prime is 55421557. The next prime is 55421567. The reversal of 55421564 is 46512455.

It is a self number, because there is not a number n which added to its sum of digits gives 55421564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421567) 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, 36299 + ... + 37794.

It is an arithmetic number, because the mean of its divisors is an integer number (4667922).

Almost surely, 2^55421564 is an apocalyptic number.

It is an amenable number.

55421564 is an abundant number, since it is smaller than the sum of its proper divisors (56608564).

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

55421564 is a wasteful number, since it uses less digits than its factorization.

55421564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74125 (or 74123 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The square root of 55421564 is about 7444.5660719749. The cubic root of 55421564 is about 381.2644031466.

The spelling of 55421564 in words is "fifty-five million, four hundred twenty-one thousand, five hundred sixty-four".