28550251980 has 48 divisors (see below), whose sum is σ = 88823007840. Its totient is φ = 7613400384.

The previous prime is 28550251973. The next prime is 28550251981. The reversal of 28550251980 is 8915205582.

It is a happy number.

28550251980 is a `hidden beast` number, since 2 + 8 + 5 + 50 + 2 + 519 + 80 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (28550251981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26434879 + ... + 26435958.

It is an arithmetic number, because the mean of its divisors is an integer number (1850479330).

Almost surely, 2^28550251980 is an apocalyptic number.

28550251980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28550251980 is an abundant number, since it is smaller than the sum of its proper divisors (60272755860).

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

28550251980 is a wasteful number, since it uses less digits than its factorization.

28550251980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52870855 (or 52870847 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The spelling of 28550251980 in words is "twenty-eight billion, five hundred fifty million, two hundred fifty-one thousand, nine hundred eighty".