55391232 has 176 divisors, whose sum is σ = 169655360. Its totient is φ = 15925248.

The previous prime is 55391227. The next prime is 55391243. The reversal of 55391232 is 23219355.

It is a self number, because there is not a number n which added to its sum of digits gives 55391232.

It is a congruent number.

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, 758748 + ... + 758820.

Almost surely, 2^55391232 is an apocalyptic number.

55391232 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 55391232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84827680).

55391232 is an abundant number, since it is smaller than the sum of its proper divisors (114264128).

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

55391232 is a wasteful number, since it uses less digits than its factorization.

55391232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 110 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 55391232 is about 7442.5286025651. The cubic root of 55391232 is about 381.1948356268.

The spelling of 55391232 in words is "fifty-five million, three hundred ninety-one thousand, two hundred thirty-two".