2157797952 has 168 divisors, whose sum is σ = 6310676736. Its totient is φ = 704830464.

The previous prime is 2157797893. The next prime is 2157797963. The reversal of 2157797952 is 2597977512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9676113 + ... + 9676335.

It is an arithmetic number, because the mean of its divisors is an integer number (37563552).

Almost surely, 2^2157797952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157797952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3155338368).

2157797952 is an abundant number, since it is smaller than the sum of its proper divisors (4152878784).

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

2157797952 is a wasteful number, since it uses less digits than its factorization.

2157797952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 492 counting only the distinct ones).

The product of its digits is 2778300, while the sum is 54.

The square root of 2157797952 is about 46452.1038490185. The cubic root of 2157797952 is about 1292.2213897888.

The spelling of 2157797952 in words is "two billion, one hundred fifty-seven million, seven hundred ninety-seven thousand, nine hundred fifty-two".