775313280 has 576 divisors, whose sum is σ = 3237932880. Its totient is φ = 170311680.

The previous prime is 775313251. The next prime is 775313291. The reversal of 775313280 is 82313577.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×775313280² = 1202221364288716800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11571807 + ... + 11571873.

Almost surely, 2^775313280 is an apocalyptic number.

775313280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775313280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1618966440).

775313280 is an abundant number, since it is smaller than the sum of its proper divisors (2462619600).

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

775313280 is a wasteful number, since it uses less digits than its factorization.

775313280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 775313280 is about 27844.4479205460. The cubic root of 775313280 is about 918.6690268773.

The spelling of 775313280 in words is "seven hundred seventy-five million, three hundred thirteen thousand, two hundred eighty".