775249920 has 224 divisors, whose sum is σ = 2760207840. Its totient is φ = 206438400.

The previous prime is 775249901. The next prime is 775249931. The reversal of 775249920 is 29942577.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 1105570 + ... + 1106270.

Almost surely, 2^775249920 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 775249920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380103920).

775249920 is an abundant number, since it is smaller than the sum of its proper divisors (1984957920).

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

775249920 is an equidigital number, since it uses as much as digits as its factorization.

775249920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 775249920 is about 27843.3101480409. The cubic root of 775249920 is about 918.6440010988.

The spelling of 775249920 in words is "seven hundred seventy-five million, two hundred forty-nine thousand, nine hundred twenty".