28154308220 has 48 divisors (see below), whose sum is σ = 59590483680. Its totient is φ = 11172992256.

The previous prime is 28154308199. The next prime is 28154308229. The reversal of 28154308220 is 2280345182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28154308229) 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, 5704874 + ... + 5709806.

It is an arithmetic number, because the mean of its divisors is an integer number (1241468410).

Almost surely, 2^28154308220 is an apocalyptic number.

28154308220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28154308220 is an abundant number, since it is smaller than the sum of its proper divisors (31436175460).

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

28154308220 is a wasteful number, since it uses less digits than its factorization.

28154308220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134 (or 7132 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 28154308220 in words is "twenty-eight billion, one hundred fifty-four million, three hundred eight thousand, two hundred twenty".