1557227264 has 72 divisors (see below), whose sum is σ = 3161561088. Its totient is φ = 765434880.

The previous prime is 1557227263. The next prime is 1557227267. The reversal of 1557227264 is 4627227551.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557227263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6859919 + ... + 6860145.

Almost surely, 2^1557227264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557227264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580780544).

1557227264 is an abundant number, since it is smaller than the sum of its proper divisors (1604333824).

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

1557227264 is a wasteful number, since it uses less digits than its factorization.

1557227264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 567 counting only the distinct ones).

The product of its digits is 235200, while the sum is 41.

The square root of 1557227264 is about 39461.7189691478. The cubic root of 1557227264 is about 1159.0904642053.

The spelling of 1557227264 in words is "one billion, five hundred fifty-seven million, two hundred twenty-seven thousand, two hundred sixty-four".