28957290 has 32 divisors (see below), whose sum is σ = 73586880. Its totient is φ = 7267584.

The previous prime is 28957277. The next prime is 28957301. The reversal of 28957290 is 9275982.

It is a Curzon number.

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, 27880 + ... + 28899.

It is an arithmetic number, because the mean of its divisors is an integer number (2299590).

Almost surely, 2^28957290 is an apocalyptic number.

28957290 is an abundant number, since it is smaller than the sum of its proper divisors (44629590).

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

28957290 is a wasteful number, since it uses less digits than its factorization.

28957290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56806.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 28957290 is about 5381.1978220467. The cubic root of 28957290 is about 307.0807824281.

The spelling of 28957290 in words is "twenty-eight million, nine hundred fifty-seven thousand, two hundred ninety".