780140761 has 27 divisors (see below), whose sum is σ = 872788413. Its totient is φ = 697157760.

The previous prime is 780140759. The next prime is 780140771. The reversal of 780140761 is 167041087.

The square root of 780140761 is 27931.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 195468361 + 584672400 = 13981^2 + 24180^2 .

It is not a de Polignac number, because 780140761 - 2¹ = 780140759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780140731) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 14719611 + ... + 14719663.

Almost surely, 2^780140761 is an apocalyptic number.

780140761 is the 27931-st square number.

780140761 is the 13966-th centered octagonal number.

It is an amenable number.

780140761 is a deficient number, since it is larger than the sum of its proper divisors (92647652).

780140761 is an equidigital number, since it uses as much as digits as its factorization.

780140761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The cubic root of 780140761 is about 920.5717779168.

The spelling of 780140761 in words is "seven hundred eighty million, one hundred forty thousand, seven hundred sixty-one".