1557481280 has 112 divisors (see below), whose sum is σ = 3824685264. Its totient is φ = 603832320.

The previous prime is 1557481249. The next prime is 1557481313. The reversal of 1557481280 is 821847551.

It can be written as a sum of positive squares in 8 ways, for example, as 73984 + 1557407296 = 272^2 + 39464^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1424414 + ... + 1425506.

Almost surely, 2^1557481280 is an apocalyptic number.

1557481280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557481280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1912342632).

1557481280 is an abundant number, since it is smaller than the sum of its proper divisors (2267203984).

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

1557481280 is a wasteful number, since it uses less digits than its factorization.

1557481280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 41.

The square root of 1557481280 is about 39464.9373495005. The cubic root of 1557481280 is about 1159.1534846610.

The spelling of 1557481280 in words is "one billion, five hundred fifty-seven million, four hundred eighty-one thousand, two hundred eighty".