1557768056 has 16 divisors (see below), whose sum is σ = 3145493400. Its totient is φ = 718969824.

The previous prime is 1557768019. The next prime is 1557768059. The reversal of 1557768056 is 6508677551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1557767995 and 1557768013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557768059) 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, 7489166 + ... + 7489373.

Almost surely, 2^1557768056 is an apocalyptic number.

It is an amenable number.

1557768056 is an abundant number, since it is smaller than the sum of its proper divisors (1587725344).

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

1557768056 is a wasteful number, since it uses less digits than its factorization.

1557768056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14978558 (or 14978554 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 50.

The square root of 1557768056 is about 39468.5704833606. The cubic root of 1557768056 is about 1159.2246245207.

The spelling of 1557768056 in words is "one billion, five hundred fifty-seven million, seven hundred sixty-eight thousand, fifty-six".