28131655620 has 24 divisors (see below), whose sum is σ = 78768635904. Its totient is φ = 7501774816.

The previous prime is 28131655613. The next prime is 28131655621. The reversal of 28131655620 is 2655613182.

It is not an unprimeable number, because it can be changed into a prime (28131655621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234430404 + ... + 234430523.

It is an arithmetic number, because the mean of its divisors is an integer number (3282026496).

Almost surely, 2^28131655620 is an apocalyptic number.

28131655620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28131655620 is an abundant number, since it is smaller than the sum of its proper divisors (50636980284).

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

28131655620 is a wasteful number, since it uses less digits than its factorization.

28131655620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468860939 (or 468860937 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 28131655620 in words is "twenty-eight billion, one hundred thirty-one million, six hundred fifty-five thousand, six hundred twenty".