2856651840 has 448 divisors, whose sum is σ = 11631168000. Its totient is φ = 646520832.

The previous prime is 2856651839. The next prime is 2856651851. The reversal of 2856651840 is 481566582.

2856651840 is a `hidden beast` number, since 2 + 8 + 566 + 5 + 1 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9011362 + ... + 9011678.

Almost surely, 2^2856651840 is an apocalyptic number.

2856651840 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 2856651840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5815584000).

2856651840 is an abundant number, since it is smaller than the sum of its proper divisors (8774516160).

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

2856651840 is a wasteful number, since it uses less digits than its factorization.

2856651840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 2856651840 is about 53447.6551403333. The cubic root of 2856651840 is about 1418.9021203756.

The spelling of 2856651840 in words is "two billion, eight hundred fifty-six million, six hundred fifty-one thousand, eight hundred forty".