2157752520 has 672 divisors, whose sum is σ = 9377415360. Its totient is φ = 433900800.

The previous prime is 2157752503. The next prime is 2157752533. The reversal of 2157752520 is 252577512.

2157752520 is a `hidden beast` number, since 2 + 15 + 77 + 52 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 167 ways as a sum of consecutive naturals, for example, 69604905 + ... + 69604935.

Almost surely, 2^2157752520 is an apocalyptic number.

2157752520 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 2157752520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4688707680).

2157752520 is an abundant number, since it is smaller than the sum of its proper divisors (7219662840).

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

2157752520 is a wasteful number, since it uses less digits than its factorization.

2157752520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The square root of 2157752520 is about 46451.6148266129. The cubic root of 2157752520 is about 1292.2123205717.

The spelling of 2157752520 in words is "two billion, one hundred fifty-seven million, seven hundred fifty-two thousand, five hundred twenty".