28687900 has 36 divisors (see below), whose sum is σ = 64964592. Its totient is φ = 10975360.

The previous prime is 28687889. The next prime is 28687909. The reversal of 28687900 is 978682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3937 + ... + 8536.

It is an arithmetic number, because the mean of its divisors is an integer number (1804572).

Almost surely, 2^28687900 is an apocalyptic number.

28687900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28687900 is an abundant number, since it is smaller than the sum of its proper divisors (36276692).

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

28687900 is a wasteful number, since it uses less digits than its factorization.

28687900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510 (or 12503 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 28687900 is about 5356.1086620792. The cubic root of 28687900 is about 306.1255554364.

The spelling of 28687900 in words is "twenty-eight million, six hundred eighty-seven thousand, nine hundred".