55632381 has 16 divisors (see below), whose sum is σ = 89760384. Its totient is φ = 29919744.

The previous prime is 55632373. The next prime is 55632397. The reversal of 55632381 is 18323655.

It is not a de Polignac number, because 55632381 - 2³ = 55632373 is a prime.

It is a super-2 number, since 2×55632381² = 6189923631458322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55632301) 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, 77560 + ... + 78273.

It is an arithmetic number, because the mean of its divisors is an integer number (5610024).

Almost surely, 2^55632381 is an apocalyptic number.

55632381 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55632381 is a deficient number, since it is larger than the sum of its proper divisors (34128003).

55632381 is a wasteful number, since it uses less digits than its factorization.

55632381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155860.

The product of its digits is 21600, while the sum is 33.

The square root of 55632381 is about 7458.7117520387. The cubic root of 55632381 is about 381.7472195323.

The spelling of 55632381 in words is "fifty-five million, six hundred thirty-two thousand, three hundred eighty-one".