2157702290 has 16 divisors (see below), whose sum is σ = 3884513112. Its totient is φ = 862936704.

The previous prime is 2157702257. The next prime is 2157702299. The reversal of 2157702290 is 922077512.

It can be written as a sum of positive squares in 4 ways, for example, as 952154449 + 1205547841 = 30857^2 + 34721^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157702290.

It is not an unprimeable number, because it can be changed into a prime (2157702299) 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, 61532 + ... + 90008.

Almost surely, 2^2157702290 is an apocalyptic number.

2157702290 is a deficient number, since it is larger than the sum of its proper divisors (1726810822).

2157702290 is a wasteful number, since it uses less digits than its factorization.

2157702290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36061.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 2157702290 is about 46451.0741533498. The cubic root of 2157702290 is about 1292.2022934211.

The spelling of 2157702290 in words is "two billion, one hundred fifty-seven million, seven hundred two thousand, two hundred ninety".