2157033780 has 384 divisors, whose sum is σ = 7955781120. Its totient is φ = 479232000.

The previous prime is 2157033761. The next prime is 2157033829. The reversal of 2157033780 is 873307512.

2157033780 is a `hidden beast` number, since 2 + 1 + 570 + 3 + 3 + 7 + 80 = 666.

It is a super-2 number, since 2×2157033780² = 9305589456122176800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4139920 + ... + 4140440.

It is an arithmetic number, because the mean of its divisors is an integer number (20718180).

Almost surely, 2^2157033780 is an apocalyptic number.

2157033780 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 2157033780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3977890560).

2157033780 is an abundant number, since it is smaller than the sum of its proper divisors (5798747340).

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

2157033780 is a wasteful number, since it uses less digits than its factorization.

2157033780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 2157033780 is about 46443.8777450807. The cubic root of 2157033780 is about 1292.0688274669.

The spelling of 2157033780 in words is "two billion, one hundred fifty-seven million, thirty-three thousand, seven hundred eighty".