55215628 has 24 divisors (see below), whose sum is σ = 105385280. Its totient is φ = 25159680.

The previous prime is 55215613. The next prime is 55215631. The reversal of 55215628 is 82651255.

55215628 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

55215628 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 55215593 and 55215602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613 + ... + 10828.

Almost surely, 2^55215628 is an apocalyptic number.

It is an amenable number.

55215628 is a deficient number, since it is larger than the sum of its proper divisors (50169652).

55215628 is a wasteful number, since it uses less digits than its factorization.

55215628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537 (or 13535 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The square root of 55215628 is about 7430.7219030186. The cubic root of 55215628 is about 380.7915816672.

The spelling of 55215628 in words is "fifty-five million, two hundred fifteen thousand, six hundred twenty-eight".