2597558220 has 168 divisors, whose sum is σ = 8236270896. Its totient is φ = 687802752.

The previous prime is 2597558213. The next prime is 2597558261. The reversal of 2597558220 is 228557952.

2597558220 is a `hidden beast` number, since 2 + 5 + 97 + 558 + 2 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2375994 + ... + 2377086.

It is an arithmetic number, because the mean of its divisors is an integer number (49025422).

Almost surely, 2^2597558220 is an apocalyptic number.

2597558220 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 2597558220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4118135448).

2597558220 is an abundant number, since it is smaller than the sum of its proper divisors (5638712676).

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

2597558220 is a wasteful number, since it uses less digits than its factorization.

2597558220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1266 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The square root of 2597558220 is about 50966.2458888233. The cubic root of 2597558220 is about 1374.6382687018.

The spelling of 2597558220 in words is "two billion, five hundred ninety-seven million, five hundred fifty-eight thousand, two hundred twenty".