2157648990 has 32 divisors (see below), whose sum is σ = 5918123520. Its totient is φ = 493176864.

The previous prime is 2157648989. The next prime is 2157648991. The reversal of 2157648990 is 998467512.

It is an interprime number because it is at equal distance from previous prime (2157648989) and next prime (2157648991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157648991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5137050 + ... + 5137469.

It is an arithmetic number, because the mean of its divisors is an integer number (184941360).

Almost surely, 2^2157648990 is an apocalyptic number.

2157648990 is an abundant number, since it is smaller than the sum of its proper divisors (3760474530).

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

2157648990 is a wasteful number, since it uses less digits than its factorization.

2157648990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10274536.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 2157648990 is about 46450.5004278748. The cubic root of 2157648990 is about 1292.1916532523.

The spelling of 2157648990 in words is "two billion, one hundred fifty-seven million, six hundred forty-eight thousand, nine hundred ninety".