28499690 has 16 divisors (see below), whose sum is σ = 52268328. Its totient is φ = 11184576.

The previous prime is 28499687. The next prime is 28499693. The reversal of 28499690 is 9699482.

It is an interprime number because it is at equal distance from previous prime (28499687) and next prime (28499693).

It can be written as a sum of positive squares in 4 ways, for example, as 26759929 + 1739761 = 5173^2 + 1319^2 .

It is a super-2 number, since 2×28499690² = 1624464660192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28499693) 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, 26357 + ... + 27416.

Almost surely, 2^28499690 is an apocalyptic number.

28499690 is a deficient number, since it is larger than the sum of its proper divisors (23768638).

28499690 is a wasteful number, since it uses less digits than its factorization.

28499690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53833.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 28499690 is about 5338.5100917765. The cubic root of 28499690 is about 305.4546297101.

The spelling of 28499690 in words is "twenty-eight million, four hundred ninety-nine thousand, six hundred ninety".