28753290 has 48 divisors (see below), whose sum is σ = 79160328. Its totient is φ = 7216128.

The previous prime is 28753279. The next prime is 28753339. The reversal of 28753290 is 9235782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27657081 + 1096209 = 5259^2 + 1047^2 .

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, 7867 + ... + 10926.

Almost surely, 2^28753290 is an apocalyptic number.

28753290 is an abundant number, since it is smaller than the sum of its proper divisors (50407038).

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

28753290 is a wasteful number, since it uses less digits than its factorization.

28753290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18823 (or 18820 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28753290 is about 5362.2094326872. The cubic root of 28753290 is about 306.3579688725.

The spelling of 28753290 in words is "twenty-eight million, seven hundred fifty-three thousand, two hundred ninety".