55609372 has 48 divisors (see below), whose sum is σ = 123040960. Its totient is φ = 21399552.

The previous prime is 55609343. The next prime is 55609373. The reversal of 55609372 is 27390655.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55609373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11404 + ... + 15532.

Almost surely, 2^55609372 is an apocalyptic number.

55609372 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55609372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61520480).

55609372 is an abundant number, since it is smaller than the sum of its proper divisors (67431588).

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

55609372 is a wasteful number, since it uses less digits than its factorization.

55609372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4188 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 55609372 is about 7457.1691679886. The cubic root of 55609372 is about 381.6945833227.

The spelling of 55609372 in words is "fifty-five million, six hundred nine thousand, three hundred seventy-two".