2156588280 has 256 divisors, whose sum is σ = 8962790400. Its totient is φ = 448104960.

The previous prime is 2156588263. The next prime is 2156588297. The reversal of 2156588280 is 828856512.

2156588280 is a `hidden beast` number, since 2 + 1 + 565 + 8 + 8 + 2 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (2156588263) and next prime (2156588297).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70194 + ... + 96126.

It is an arithmetic number, because the mean of its divisors is an integer number (35010900).

Almost surely, 2^2156588280 is an apocalyptic number.

2156588280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156588280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4481395200).

2156588280 is an abundant number, since it is smaller than the sum of its proper divisors (6806202120).

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

2156588280 is a wasteful number, since it uses less digits than its factorization.

2156588280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25971 (or 25961 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 2156588280 is about 46439.0813862634. The cubic root of 2156588280 is about 1291.9798694573.

The spelling of 2156588280 in words is "two billion, one hundred fifty-six million, five hundred eighty-eight thousand, two hundred eighty".