28369220 has 24 divisors (see below), whose sum is σ = 64991808. Its totient is φ = 10316000.

The previous prime is 28369213. The next prime is 28369249. The reversal of 28369220 is 2296382.

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, 64256 + ... + 64695.

It is an arithmetic number, because the mean of its divisors is an integer number (2707992).

Almost surely, 2^28369220 is an apocalyptic number.

28369220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28369220 is an abundant number, since it is smaller than the sum of its proper divisors (36622588).

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

28369220 is a wasteful number, since it uses less digits than its factorization.

28369220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128971 (or 128969 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28369220 is about 5326.2763728519. The cubic root of 28369220 is about 304.9877984907.

The spelling of 28369220 in words is "twenty-eight million, three hundred sixty-nine thousand, two hundred twenty".