28991527830 has 256 divisors, whose sum is σ = 86294937600. Its totient is φ = 6888499200.

The previous prime is 28991527819. The next prime is 28991527837. The reversal of 28991527830 is 3872519982.

28991527830 is a `hidden beast` number, since 2 + 89 + 9 + 1 + 527 + 8 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28991527837) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10661211 + ... + 10663929.

It is an arithmetic number, because the mean of its divisors is an integer number (337089600).

Almost surely, 2^28991527830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28991527830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43147468800).

28991527830 is an abundant number, since it is smaller than the sum of its proper divisors (57303409770).

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

28991527830 is a wasteful number, since it uses less digits than its factorization.

28991527830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876 (or 2870 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 28991527830 in words is "twenty-eight billion, nine hundred ninety-one million, five hundred twenty-seven thousand, eight hundred thirty".