1561263260 has 24 divisors (see below), whose sum is σ = 3283655760. Its totient is φ = 623552384.

The previous prime is 1561263181. The next prime is 1561263331. The reversal of 1561263260 is 623621651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46049 + ... + 72408.

It is an arithmetic number, because the mean of its divisors is an integer number (136818990).

Almost surely, 2^1561263260 is an apocalyptic number.

1561263260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561263260 is an abundant number, since it is smaller than the sum of its proper divisors (1722392500).

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

1561263260 is a wasteful number, since it uses less digits than its factorization.

1561263260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119125 (or 119123 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1561263260 is about 39512.8239942427. The cubic root of 1561263260 is about 1160.0909708680.

The spelling of 1561263260 in words is "one billion, five hundred sixty-one million, two hundred sixty-three thousand, two hundred sixty".