28057290 has 16 divisors (see below), whose sum is σ = 67337568. Its totient is φ = 7481936.

The previous prime is 28057279. The next prime is 28057307. The reversal of 28057290 is 9275082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467592 + ... + 467651.

It is an arithmetic number, because the mean of its divisors is an integer number (4208598).

Almost surely, 2^28057290 is an apocalyptic number.

28057290 is an abundant number, since it is smaller than the sum of its proper divisors (39280278).

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

28057290 is a wasteful number, since it uses less digits than its factorization.

28057290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935253.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28057290 is about 5296.9132520743. The cubic root of 28057290 is about 303.8658586969.

The spelling of 28057290 in words is "twenty-eight million, fifty-seven thousand, two hundred ninety".