28919290 has 8 divisors (see below), whose sum is σ = 52054740. Its totient is φ = 11567712.

The previous prime is 28919281. The next prime is 28919321. The reversal of 28919290 is 9291982.

It can be written as a sum of positive squares in 2 ways, for example, as 28697449 + 221841 = 5357^2 + 471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445955 + ... + 1445974.

Almost surely, 2^28919290 is an apocalyptic number.

28919290 is a deficient number, since it is larger than the sum of its proper divisors (23135450).

28919290 is a wasteful number, since it uses less digits than its factorization.

28919290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891936.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 28919290 is about 5377.6658505340. The cubic root of 28919290 is about 306.9463985613.

The spelling of 28919290 in words is "twenty-eight million, nine hundred nineteen thousand, two hundred ninety".