28690636 has 12 divisors (see below), whose sum is σ = 54070912. Its totient is φ = 13241808.

The previous prime is 28690619. The next prime is 28690639. The reversal of 28690636 is 63609682.

It is not an unprimeable number, because it can be changed into a prime (28690639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275820 + ... + 275923.

Almost surely, 2^28690636 is an apocalyptic number.

28690636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28690636 is a deficient number, since it is larger than the sum of its proper divisors (25380276).

28690636 is a wasteful number, since it uses less digits than its factorization.

28690636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551760 (or 551758 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 28690636 is about 5356.3640652965. The cubic root of 28690636 is about 306.1352869828.

The spelling of 28690636 in words is "twenty-eight million, six hundred ninety thousand, six hundred thirty-six".