28912900 has 18 divisors (see below), whose sum is σ = 62741210. Its totient is φ = 11565120.

The previous prime is 28912883. The next prime is 28912951. The reversal of 28912900 is 921982.

It can be written as a sum of positive squares in 3 ways, for example, as 695556 + 28217344 = 834^2 + 5312^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144465 + ... + 144664.

Almost surely, 2^28912900 is an apocalyptic number.

28912900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28912900 is an abundant number, since it is smaller than the sum of its proper divisors (33828310).

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

28912900 is a wasteful number, since it uses less digits than its factorization.

28912900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289143 (or 289136 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 28912900 is about 5377.0716937753. The cubic root of 28912900 is about 306.9237892929.

The spelling of 28912900 in words is "twenty-eight million, nine hundred twelve thousand, nine hundred".