28905421320 has 128 divisors (see below), whose sum is σ = 96388704000. Its totient is φ = 7705128960.

The previous prime is 28905421313. The next prime is 28905421331. The reversal of 28905421320 is 2312450982.

It is a happy number.

28905421320 is a `hidden beast` number, since 2 + 8 + 90 + 542 + 1 + 3 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 5309800 + ... + 5315240.

It is an arithmetic number, because the mean of its divisors is an integer number (753036750).

Almost surely, 2^28905421320 is an apocalyptic number.

28905421320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28905421320 is an abundant number, since it is smaller than the sum of its proper divisors (67483282680).

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

28905421320 is a wasteful number, since it uses less digits than its factorization.

28905421320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10380 (or 10370 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 28905421320 in words is "twenty-eight billion, nine hundred five million, four hundred twenty-one thousand, three hundred twenty".