28569490 has 16 divisors (see below), whose sum is σ = 51525720. Its totient is φ = 11405440.

The previous prime is 28569487. The next prime is 28569493. The reversal of 28569490 is 9496582.

It is an interprime number because it is at equal distance from previous prime (28569487) and next prime (28569493).

It can be written as a sum of positive squares in 4 ways, for example, as 24019801 + 4549689 = 4901^2 + 2133^2 .

It is not an unprimeable number, because it can be changed into a prime (28569493) 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, 3180 + ... + 8200.

Almost surely, 2^28569490 is an apocalyptic number.

28569490 is a deficient number, since it is larger than the sum of its proper divisors (22956230).

28569490 is a wasteful number, since it uses less digits than its factorization.

28569490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 28569490 is about 5345.0434984198. The cubic root of 28569490 is about 305.7037944193.

The spelling of 28569490 in words is "twenty-eight million, five hundred sixty-nine thousand, four hundred ninety".