28900981440 has 168 divisors, whose sum is σ = 103089364560. Its totient is φ = 7706907648.

The previous prime is 28900981433. The next prime is 28900981469. The reversal of 28900981440 is 4418900982.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 108075 + ... + 263594.

It is an arithmetic number, because the mean of its divisors is an integer number (613627170).

Almost surely, 2^28900981440 is an apocalyptic number.

28900981440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28900981440 is an abundant number, since it is smaller than the sum of its proper divisors (74188383120).

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

28900981440 is an equidigital number, since it uses as much as digits as its factorization.

28900981440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371701 (or 371679 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 28900981440 in words is "twenty-eight billion, nine hundred million, nine hundred eighty-one thousand, four hundred forty".