55032781 has 8 divisors (see below), whose sum is σ = 57772800. Its totient is φ = 52353120.

The previous prime is 55032773. The next prime is 55032799. The reversal of 55032781 is 18723055.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55032781 - 2³ = 55032773 is a prime.

It is a super-2 number, since 2×55032781² = 6057213969187922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55032581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13216 + ... + 16873.

It is an arithmetic number, because the mean of its divisors is an integer number (7221600).

Almost surely, 2^55032781 is an apocalyptic number.

It is an amenable number.

55032781 is a deficient number, since it is larger than the sum of its proper divisors (2740019).

55032781 is a wasteful number, since it uses less digits than its factorization.

55032781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30179.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55032781 is about 7418.4082524488. The cubic root of 55032781 is about 380.3707853642.

The spelling of 55032781 in words is "fifty-five million, thirty-two thousand, seven hundred eighty-one".