2780891874 has 48 divisors (see below), whose sum is σ = 6146175672. Its totient is φ = 908404224.

The previous prime is 2780891863. The next prime is 2780891879. The reversal of 2780891874 is 4781980872.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2265284025 + 515607849 = 47595^2 + 22707^2 .

It is a super-2 number, since 2×2780891874² = 15466719229758463752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2780891874.

It is not an unprimeable number, because it can be changed into a prime (2780891879) 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 23 ways as a sum of consecutive naturals, for example, 1480624 + ... + 1482500.

Almost surely, 2^2780891874 is an apocalyptic number.

2780891874 is an abundant number, since it is smaller than the sum of its proper divisors (3365283798).

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

2780891874 is a wasteful number, since it uses less digits than its factorization.

2780891874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491 (or 3488 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The square root of 2780891874 is about 52734.1623049044. The cubic root of 2780891874 is about 1406.2462187513.

The spelling of 2780891874 in words is "two billion, seven hundred eighty million, eight hundred ninety-one thousand, eight hundred seventy-four".