1057559780 has 48 divisors (see below), whose sum is σ = 2323157760. Its totient is φ = 403632768.

The previous prime is 1057559777. The next prime is 1057559801. The reversal of 1057559780 is 879557501.

It is a happy number.

It is a super-2 number, since 2×1057559780² = 2236865376547296800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

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, 199322 + ... + 204558.

It is an arithmetic number, because the mean of its divisors is an integer number (48399120).

Almost surely, 2^1057559780 is an apocalyptic number.

1057559780 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 1057559780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161578880).

1057559780 is an abundant number, since it is smaller than the sum of its proper divisors (1265597980).

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

1057559780 is a wasteful number, since it uses less digits than its factorization.

1057559780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5708 (or 5706 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 47.

The square root of 1057559780 is about 32520.1442186224. The cubic root of 1057559780 is about 1018.8298062864.

The spelling of 1057559780 in words is "one billion, fifty-seven million, five hundred fifty-nine thousand, seven hundred eighty".