28297120 has 24 divisors (see below), whose sum is σ = 66852324. Its totient is φ = 11318784.

The previous prime is 28297109. The next prime is 28297133. The reversal of 28297120 is 2179282.

It can be written as a sum of positive squares in 2 ways, for example, as 26749584 + 1547536 = 5172^2 + 1244^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88269 + ... + 88588.

Almost surely, 2^28297120 is an apocalyptic number.

28297120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28297120 is an abundant number, since it is smaller than the sum of its proper divisors (38555204).

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

28297120 is a wasteful number, since it uses less digits than its factorization.

28297120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176872 (or 176864 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28297120 is about 5319.5037362521. The cubic root of 28297120 is about 304.7292051350.

The spelling of 28297120 in words is "twenty-eight million, two hundred ninety-seven thousand, one hundred twenty".