1561976896 has 28 divisors (see below), whose sum is σ = 3145818448. Its totient is φ = 769329792.

The previous prime is 1561976893. The next prime is 1561976903. The reversal of 1561976896 is 6986791651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561976896.

It is not an unprimeable number, because it can be changed into a prime (1561976893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177846 + ... + 186421.

Almost surely, 2^1561976896 is an apocalyptic number.

1561976896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561976896 is an abundant number, since it is smaller than the sum of its proper divisors (1583841552).

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

1561976896 is an equidigital number, since it uses as much as digits as its factorization.

1561976896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364346 (or 364336 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 58.

The square root of 1561976896 is about 39521.8533978355. The cubic root of 1561976896 is about 1160.2676988196.

The spelling of 1561976896 in words is "one billion, five hundred sixty-one million, nine hundred seventy-six thousand, eight hundred ninety-six".