28909490 has 8 divisors (see below), whose sum is σ = 52037100. Its totient is φ = 11563792.

The previous prime is 28909477. The next prime is 28909499. The reversal of 28909490 is 9490982.

It can be written as a sum of positive squares in 2 ways, for example, as 26183689 + 2725801 = 5117^2 + 1651^2 .

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

It is a super-2 number, since 2×28909490² = 1671517224120200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28909499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445465 + ... + 1445484.

Almost surely, 2^28909490 is an apocalyptic number.

28909490 is a deficient number, since it is larger than the sum of its proper divisors (23127610).

28909490 is a wasteful number, since it uses less digits than its factorization.

28909490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890956.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 28909490 is about 5376.7545973384. The cubic root of 28909490 is about 306.9117225768.

The spelling of 28909490 in words is "twenty-eight million, nine hundred nine thousand, four hundred ninety".