2780961644 has 12 divisors (see below), whose sum is σ = 4873876224. Its totient is φ = 1388425584.

The previous prime is 2780961613. The next prime is 2780961683. The reversal of 2780961644 is 4461690872.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510764 + ... + 516179.

It is an arithmetic number, because the mean of its divisors is an integer number (406156352).

Almost surely, 2^2780961644 is an apocalyptic number.

It is an amenable number.

2780961644 is a deficient number, since it is larger than the sum of its proper divisors (2092914580).

2780961644 is a wasteful number, since it uses less digits than its factorization.

2780961644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027624 (or 1027622 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 2780961644 is about 52734.8238263863. The cubic root of 2780961644 is about 1406.2579791244.

The spelling of 2780961644 in words is "two billion, seven hundred eighty million, nine hundred sixty-one thousand, six hundred forty-four".