28774220 has 24 divisors (see below), whose sum is σ = 60550224. Its totient is φ = 11486016.

The previous prime is 28774211. The next prime is 28774243. The reversal of 28774220 is 2247782.

It is a happy number.

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, 11087 + ... + 13433.

It is an arithmetic number, because the mean of its divisors is an integer number (2522926).

Almost surely, 2^28774220 is an apocalyptic number.

28774220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28774220 is an abundant number, since it is smaller than the sum of its proper divisors (31776004).

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

28774220 is a wasteful number, since it uses less digits than its factorization.

28774220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969 (or 2967 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 28774220 is about 5364.1606985623. The cubic root of 28774220 is about 306.4322852041.

The spelling of 28774220 in words is "twenty-eight million, seven hundred seventy-four thousand, two hundred twenty".