1851079680 has 396 divisors, whose sum is σ = 6862444680. Its totient is φ = 461242368.

The previous prime is 1851079679. The next prime is 1851079687. The reversal of 1851079680 is 869701581.

1851079680 is a `hidden beast` number, since 1 + 8 + 510 + 79 + 68 + 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 not an unprimeable number, because it can be changed into a prime (1851079687) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 13317051 + ... + 13317189.

Almost surely, 2^1851079680 is an apocalyptic number.

1851079680 is a gapful number since it is divisible by the number (10) 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 1851079680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3431222340).

1851079680 is an abundant number, since it is smaller than the sum of its proper divisors (5011365000).

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

1851079680 is a wasteful number, since it uses less digits than its factorization.

1851079680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 1851079680 is about 43024.1755295787. The cubic root of 1851079680 is about 1227.8397934925.

The spelling of 1851079680 in words is "one billion, eight hundred fifty-one million, seventy-nine thousand, six hundred eighty".