2156836500 has 576 divisors, whose sum is σ = 8776535040. Its totient is φ = 433382400.

The previous prime is 2156836469. The next prime is 2156836511. The reversal of 2156836500 is 56386512.

2156836500 is a `hidden beast` number, since 21 + 56 + 83 + 6 + 500 = 666.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9418386 + ... + 9418614.

It is an arithmetic number, because the mean of its divisors is an integer number (15237040).

Almost surely, 2^2156836500 is an apocalyptic number.

2156836500 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 2156836500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4388267520).

2156836500 is an abundant number, since it is smaller than the sum of its proper divisors (6619698540).

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

2156836500 is a wasteful number, since it uses less digits than its factorization.

2156836500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 2156836500 is about 46441.7538428514. The cubic root of 2156836500 is about 1292.0294358555.

It can be divided in two parts, 21 and 56836500, that added together give a square (56836521 = 7539²).

The spelling of 2156836500 in words is "two billion, one hundred fifty-six million, eight hundred thirty-six thousand, five hundred".