27915122920 has 16 divisors (see below), whose sum is σ = 62809026660. Its totient is φ = 11166049152.

The previous prime is 27915122891. The next prime is 27915122927. The reversal of 27915122920 is 2922151972.

It can be written as a sum of positive squares in 2 ways, for example, as 27031963396 + 883159524 = 164414^2 + 29718^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 697878073 = 27915122920 / (2 + 7 + 9 + 1 + 5 + 1 + 2 + 2 + 9 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (27915122927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348938997 + ... + 348939076.

Almost surely, 2^27915122920 is an apocalyptic number.

27915122920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27915122920 is an abundant number, since it is smaller than the sum of its proper divisors (34893903740).

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

27915122920 is a wasteful number, since it uses less digits than its factorization.

27915122920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697878084 (or 697878080 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 27915122920 in words is "twenty-seven billion, nine hundred fifteen million, one hundred twenty-two thousand, nine hundred twenty".