2781788654 has 16 divisors (see below), whose sum is σ = 4195088496. Its totient is φ = 1383446400.

The previous prime is 2781788641. The next prime is 2781788677. The reversal of 2781788654 is 4568871872.

It is a self number, because there is not a number n which added to its sum of digits gives 2781788654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287414 + ... + 296934.

It is an arithmetic number, because the mean of its divisors is an integer number (262193031).

Almost surely, 2^2781788654 is an apocalyptic number.

2781788654 is a deficient number, since it is larger than the sum of its proper divisors (1413299842).

2781788654 is a wasteful number, since it uses less digits than its factorization.

2781788654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10291.

The product of its digits is 6021120, while the sum is 56.

The square root of 2781788654 is about 52742.6644567754. The cubic root of 2781788654 is about 1406.3973642599.

The spelling of 2781788654 in words is "two billion, seven hundred eighty-one million, seven hundred eighty-eight thousand, six hundred fifty-four".