28358220 has 48 divisors (see below), whose sum is σ = 86623488. Its totient is φ = 6874560.

The previous prime is 28358191. The next prime is 28358257. The reversal of 28358220 is 2285382.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 20824 + ... + 22143.

It is an arithmetic number, because the mean of its divisors is an integer number (1804656).

Almost surely, 2^28358220 is an apocalyptic number.

28358220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28358220 is an abundant number, since it is smaller than the sum of its proper divisors (58265268).

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

28358220 is a wasteful number, since it uses less digits than its factorization.

28358220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42990 (or 42988 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28358220 is about 5325.2436563973. The cubic root of 28358220 is about 304.9483743132.

The spelling of 28358220 in words is "twenty-eight million, three hundred fifty-eight thousand, two hundred twenty".