765771090 has 128 divisors (see below), whose sum is σ = 2168432640. Its totient is φ = 169440768.

The previous prime is 765771077. The next prime is 765771101. The reversal of 765771090 is 90177567.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1236801 + ... + 1237419.

It is an arithmetic number, because the mean of its divisors is an integer number (16940880).

Almost surely, 2^765771090 is an apocalyptic number.

765771090 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 765771090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1084216320).

765771090 is an abundant number, since it is smaller than the sum of its proper divisors (1402661550).

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

765771090 is a wasteful number, since it uses less digits than its factorization.

765771090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 92610, while the sum is 42.

The square root of 765771090 is about 27672.5692699467. The cubic root of 765771090 is about 914.8846102511.

The spelling of 765771090 in words is "seven hundred sixty-five million, seven hundred seventy-one thousand, ninety".