2157787520 has 192 divisors, whose sum is σ = 6080281200. Its totient is φ = 730017792.

The previous prime is 2157787507. The next prime is 2157787529. The reversal of 2157787520 is 257877512.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157787529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2602466 + ... + 2603294.

Almost surely, 2^2157787520 is an apocalyptic number.

2157787520 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 2157787520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3040140600).

2157787520 is an abundant number, since it is smaller than the sum of its proper divisors (3922493680).

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

2157787520 is an equidigital number, since it uses as much as digits as its factorization.

2157787520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 44.

The square root of 2157787520 is about 46451.9915611807. The cubic root of 2157787520 is about 1292.2193073455.

The spelling of 2157787520 in words is "two billion, one hundred fifty-seven million, seven hundred eighty-seven thousand, five hundred twenty".