28750290 has 16 divisors (see below), whose sum is σ = 69000768. Its totient is φ = 7666736.

The previous prime is 28750289. The next prime is 28750301. The reversal of 28750290 is 9205782.

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, 479142 + ... + 479201.

It is an arithmetic number, because the mean of its divisors is an integer number (4312548).

Almost surely, 2^28750290 is an apocalyptic number.

28750290 is an abundant number, since it is smaller than the sum of its proper divisors (40250478).

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

28750290 is a wasteful number, since it uses less digits than its factorization.

28750290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958353.

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

The square root of 28750290 is about 5361.9296899530. The cubic root of 28750290 is about 306.3473137918.

The spelling of 28750290 in words is "twenty-eight million, seven hundred fifty thousand, two hundred ninety".