28991029032 has 128 divisors (see below), whose sum is σ = 93296121600. Its totient is φ = 8169652224.

The previous prime is 28991029021. The next prime is 28991029043. The reversal of 28991029032 is 23092019982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28991029021) and next prime (28991029043).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20953 + ... + 241704.

It is an arithmetic number, because the mean of its divisors is an integer number (728875950).

Almost surely, 2^28991029032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28991029032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46648060800).

28991029032 is an abundant number, since it is smaller than the sum of its proper divisors (64305092568).

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

28991029032 is a wasteful number, since it uses less digits than its factorization.

28991029032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262752 (or 262742 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 28991029032 in words is "twenty-eight billion, nine hundred ninety-one million, twenty-nine thousand, thirty-two".