2781561496 has 32 divisors (see below), whose sum is σ = 5962602240. Its totient is φ = 1191675168.

The previous prime is 2781561457. The next prime is 2781561499. The reversal of 2781561496 is 6941651872.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781561499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190471 + ... + 204553.

It is an arithmetic number, because the mean of its divisors is an integer number (186331320).

Almost surely, 2^2781561496 is an apocalyptic number.

It is an amenable number.

2781561496 is an abundant number, since it is smaller than the sum of its proper divisors (3181040744).

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

2781561496 is a wasteful number, since it uses less digits than its factorization.

2781561496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17623 (or 17619 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 2781561496 is about 52740.5109569485. The cubic root of 2781561496 is about 1406.3590815638.

The spelling of 2781561496 in words is "two billion, seven hundred eighty-one million, five hundred sixty-one thousand, four hundred ninety-six".