28880390 has 32 divisors (see below), whose sum is σ = 64813824. Its totient is φ = 9001440.

The previous prime is 28880381. The next prime is 28880407. The reversal of 28880390 is 9308882.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 17984 + ... + 19523.

It is an arithmetic number, because the mean of its divisors is an integer number (2025432).

Almost surely, 2^28880390 is an apocalyptic number.

28880390 is an abundant number, since it is smaller than the sum of its proper divisors (35933434).

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

28880390 is a wasteful number, since it uses less digits than its factorization.

28880390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37532.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28880390 is about 5374.0478226380. The cubic root of 28880390 is about 306.8087099275.

The spelling of 28880390 in words is "twenty-eight million, eight hundred eighty thousand, three hundred ninety".