775641320 has 96 divisors (see below), whose sum is σ = 1868340600. Its totient is φ = 289738752.

The previous prime is 775641311. The next prime is 775641367. The reversal of 775641320 is 23146577.

It can be written as a sum of positive squares in 12 ways, for example, as 647906116 + 127735204 = 25454^2 + 11302^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2647094 + ... + 2647386.

Almost surely, 2^775641320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775641320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934170300).

775641320 is an abundant number, since it is smaller than the sum of its proper divisors (1092699280).

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

775641320 is a wasteful number, since it uses less digits than its factorization.

775641320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 775641320 is about 27850.3378794585. The cubic root of 775641320 is about 918.7985735190.

Adding to 775641320 its reverse (23146577), we get a palindrome (798787897).

The spelling of 775641320 in words is "seven hundred seventy-five million, six hundred forty-one thousand, three hundred twenty".