2156857428 has 144 divisors (see below), whose sum is σ = 5983127360. Its totient is φ = 602173440.

The previous prime is 2156857427. The next prime is 2156857429. The reversal of 2156857428 is 8247586512.

It is an interprime number because it is at equal distance from previous prime (2156857427) and next prime (2156857429).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156857421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1019700 + ... + 1021812.

Almost surely, 2^2156857428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156857428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2991563680).

2156857428 is an abundant number, since it is smaller than the sum of its proper divisors (3826269932).

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

2156857428 is a wasteful number, since it uses less digits than its factorization.

2156857428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198 (or 2185 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 48.

The square root of 2156857428 is about 46441.9791567930. The cubic root of 2156857428 is about 1292.0336147388.

The spelling of 2156857428 in words is "two billion, one hundred fifty-six million, eight hundred fifty-seven thousand, four hundred twenty-eight".