2157967800 has 144 divisors (see below), whose sum is σ = 7261254000. Its totient is φ = 574341120.

The previous prime is 2157967793. The next prime is 2157967831. The reversal of 2157967800 is 87697512.

2157967800 is a `hidden beast` number, since 2 + 1 + 579 + 6 + 78 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1383421 + ... + 1384979.

It is an arithmetic number, because the mean of its divisors is an integer number (50425375).

Almost surely, 2^2157967800 is an apocalyptic number.

2157967800 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 2157967800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3630627000).

2157967800 is an abundant number, since it is smaller than the sum of its proper divisors (5103286200).

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

2157967800 is a wasteful number, since it uses less digits than its factorization.

2157967800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350 (or 2338 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 2157967800 is about 46453.9320187215. The cubic root of 2157967800 is about 1292.2552940228.

The spelling of 2157967800 in words is "two billion, one hundred fifty-seven million, nine hundred sixty-seven thousand, eight hundred".