28156534300 has 72 divisors (see below), whose sum is σ = 63118321280. Its totient is φ = 10891065600.

The previous prime is 28156534297. The next prime is 28156534319. The reversal of 28156534300 is 343565182.

It is a self number, because there is not a number n which added to its sum of digits gives 28156534300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5543362 + ... + 5548438.

Almost surely, 2^28156534300 is an apocalyptic number.

28156534300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28156534300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31559160640).

28156534300 is an abundant number, since it is smaller than the sum of its proper divisors (34961786980).

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

28156534300 is a wasteful number, since it uses less digits than its factorization.

28156534300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911 (or 6904 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 28156534300 in words is "twenty-eight billion, one hundred fifty-six million, five hundred thirty-four thousand, three hundred".