775361280 has 144 divisors (see below), whose sum is σ = 2584270080. Its totient is φ = 197750784.

The previous prime is 775361273. The next prime is 775361297. The reversal of 775361280 is 82163577.

It is a super-2 number, since 2×775361280² = 1202370229046476800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83931 + ... + 92709.

It is an arithmetic number, because the mean of its divisors is an integer number (17946320).

Almost surely, 2^775361280 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 775361280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292135040).

775361280 is an abundant number, since it is smaller than the sum of its proper divisors (1808908800).

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

775361280 is a wasteful number, since it uses less digits than its factorization.

775361280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8826 (or 8812 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 775361280 is about 27845.3098384629. The cubic root of 775361280 is about 918.6879848927.

The spelling of 775361280 in words is "seven hundred seventy-five million, three hundred sixty-one thousand, two hundred eighty".