2157425780 has 36 divisors (see below), whose sum is σ = 4681498500. Its totient is φ = 835125120.

The previous prime is 2157425779. The next prime is 2157425827. The reversal of 2157425780 is 875247512.

It can be written as a sum of positive squares in 2 ways, for example, as 1472870884 + 684554896 = 38378^2 + 26164^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36905 + ... + 75344.

It is an arithmetic number, because the mean of its divisors is an integer number (130041625).

Almost surely, 2^2157425780 is an apocalyptic number.

2157425780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157425780 is an abundant number, since it is smaller than the sum of its proper divisors (2524072720).

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

2157425780 is a wasteful number, since it uses less digits than its factorization.

2157425780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112320 (or 112287 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 2157425780 is about 46448.0977005517. The cubic root of 2157425780 is about 1292.1470923982.

The spelling of 2157425780 in words is "two billion, one hundred fifty-seven million, four hundred twenty-five thousand, seven hundred eighty".