28387801500 has 48 divisors (see below), whose sum is σ = 82665282336. Its totient is φ = 7570080000.

The previous prime is 28387801499. The next prime is 28387801501. The reversal of 28387801500 is 510878382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28387801499) and next prime (28387801501).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387801501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9461101 + ... + 9464100.

It is an arithmetic number, because the mean of its divisors is an integer number (1722193382).

Almost surely, 2^28387801500 is an apocalyptic number.

28387801500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28387801500 is an abundant number, since it is smaller than the sum of its proper divisors (54277480836).

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

28387801500 is a wasteful number, since it uses less digits than its factorization.

28387801500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18925223 (or 18925211 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 28387801500 in words is "twenty-eight billion, three hundred eighty-seven million, eight hundred one thousand, five hundred".