28947900 has 36 divisors (see below), whose sum is σ = 83756792. Its totient is φ = 7719360.

The previous prime is 28947883. The next prime is 28947943. The reversal of 28947900 is 974982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47947 + ... + 48546.

Almost surely, 2^28947900 is an apocalyptic number.

28947900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28947900 is an abundant number, since it is smaller than the sum of its proper divisors (54808892).

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

28947900 is a wasteful number, since it uses less digits than its factorization.

28947900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96510 (or 96503 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28947900 is about 5380.3252689777. The cubic root of 28947900 is about 307.0475864088.

The spelling of 28947900 in words is "twenty-eight million, nine hundred forty-seven thousand, nine hundred".