1261820760 has 32 divisors (see below), whose sum is σ = 3785462640. Its totient is φ = 336485504.

The previous prime is 1261820741. The next prime is 1261820783. The reversal of 1261820760 is 670281621.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5257467 + ... + 5257706.

Almost surely, 2^1261820760 is an apocalyptic number.

1261820760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261820760 is an abundant number, since it is smaller than the sum of its proper divisors (2523641880).

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

1261820760 is a wasteful number, since it uses less digits than its factorization.

1261820760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515187 (or 10515183 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1261820760 is about 35522.1164909975. The cubic root of 1261820760 is about 1080.6023046422.

The spelling of 1261820760 in words is "one billion, two hundred sixty-one million, eight hundred twenty thousand, seven hundred sixty".