55828620 has 72 divisors (see below), whose sum is σ = 173309136. Its totient is φ = 14539392.

The previous prime is 55828609. The next prime is 55828639. The reversal of 55828620 is 2682855.

55828620 is a `hidden beast` number, since 5 + 5 + 8 + 28 + 620 = 666.

It is a super-2 number, since 2×55828620² = 6233669622208800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4134 + ... + 11346.

Almost surely, 2^55828620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55828620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86654568).

55828620 is an abundant number, since it is smaller than the sum of its proper divisors (117480516).

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

55828620 is a wasteful number, since it uses less digits than its factorization.

55828620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7271 (or 7266 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 55828620 is about 7471.8551913163. The cubic root of 55828620 is about 382.1955542333.

The spelling of 55828620 in words is "fifty-five million, eight hundred twenty-eight thousand, six hundred twenty".