28809788580 has 72 divisors (see below), whose sum is σ = 87405357312. Its totient is φ = 7681233216.

The previous prime is 28809788561. The next prime is 28809788587. The reversal of 28809788580 is 8588790882.

It is not an unprimeable number, because it can be changed into a prime (28809788587) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1354387 + ... + 1375493.

It is an arithmetic number, because the mean of its divisors is an integer number (1213963296).

Almost surely, 2^28809788580 is an apocalyptic number.

28809788580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28809788580 is an abundant number, since it is smaller than the sum of its proper divisors (58595568732).

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

28809788580 is a wasteful number, since it uses less digits than its factorization.

28809788580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28705 (or 28700 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 63.

The spelling of 28809788580 in words is "twenty-eight billion, eight hundred nine million, seven hundred eighty-eight thousand, five hundred eighty".