2157528500 has 24 divisors (see below), whose sum is σ = 4712043336. Its totient is φ = 863011200.

The previous prime is 2157528491. The next prime is 2157528509. The reversal of 2157528500 is 58257512.

It is an interprime number because it is at equal distance from previous prime (2157528491) and next prime (2157528509).

It can be written as a sum of positive squares in 4 ways, for example, as 2155024 + 2155373476 = 1468^2 + 46426^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157528509) 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, 2157029 + ... + 2158028.

It is an arithmetic number, because the mean of its divisors is an integer number (196335139).

Almost surely, 2^2157528500 is an apocalyptic number.

2157528500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157528500 is an abundant number, since it is smaller than the sum of its proper divisors (2554514836).

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

2157528500 is a wasteful number, since it uses less digits than its factorization.

2157528500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4315076 (or 4315064 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 2157528500 is about 46449.2034377340. The cubic root of 2157528500 is about 1292.1675994371.

The spelling of 2157528500 in words is "two billion, one hundred fifty-seven million, five hundred twenty-eight thousand, five hundred".