28708490 has 16 divisors (see below), whose sum is σ = 51742152. Its totient is φ = 11468544.

The previous prime is 28708481. The next prime is 28708499. The reversal of 28708490 is 9480782.

It is an interprime number because it is at equal distance from previous prime (28708481) and next prime (28708499).

It can be written as a sum of positive squares in 4 ways, for example, as 26801329 + 1907161 = 5177^2 + 1381^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28708499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9662 + ... + 12278.

Almost surely, 2^28708490 is an apocalyptic number.

28708490 is a deficient number, since it is larger than the sum of its proper divisors (23033662).

28708490 is a wasteful number, since it uses less digits than its factorization.

28708490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28708490 is about 5358.0304217128. The cubic root of 28708490 is about 306.1987758280.

The spelling of 28708490 in words is "twenty-eight million, seven hundred eight thousand, four hundred ninety".