28687431800 has 24 divisors (see below), whose sum is σ = 66698279400. Its totient is φ = 11474972640.

The previous prime is 28687431797. The next prime is 28687431803. The reversal of 28687431800 is 813478682.

It is an interprime number because it is at equal distance from previous prime (28687431797) and next prime (28687431803).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687431803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71718380 + ... + 71718779.

It is an arithmetic number, because the mean of its divisors is an integer number (2779094975).

Almost surely, 2^28687431800 is an apocalyptic number.

28687431800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28687431800 is an abundant number, since it is smaller than the sum of its proper divisors (38010847600).

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

28687431800 is a wasteful number, since it uses less digits than its factorization.

28687431800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143437175 (or 143437166 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 28687431800 in words is "twenty-eight billion, six hundred eighty-seven million, four hundred thirty-one thousand, eight hundred".