28690584 has 32 divisors (see below), whose sum is σ = 77244720. Its totient is φ = 8827776.

The previous prime is 28690567. The next prime is 28690609. The reversal of 28690584 is 48509682.

It is a super-2 number, since 2×28690584² = 1646299220522112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45667 + ... + 46290.

Almost surely, 2^28690584 is an apocalyptic number.

28690584 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28690584 is an abundant number, since it is smaller than the sum of its proper divisors (48554136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28690584 is a wasteful number, since it uses less digits than its factorization.

28690584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91979 (or 91975 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 28690584 is about 5356.3592112553. The cubic root of 28690584 is about 306.1351020323.

The spelling of 28690584 in words is "twenty-eight million, six hundred ninety thousand, five hundred eighty-four".