775839540 has 432 divisors, whose sum is σ = 2889577152. Its totient is φ = 154441728.

The previous prime is 775839539. The next prime is 775839601. The reversal of 775839540 is 45938577.

It is a self number, because there is not a number n which added to its sum of digits gives 775839540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 18042759 + ... + 18042801.

It is an arithmetic number, because the mean of its divisors is an integer number (6688836).

Almost surely, 2^775839540 is an apocalyptic number.

775839540 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 775839540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444788576).

775839540 is an abundant number, since it is smaller than the sum of its proper divisors (2113737612).

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

775839540 is a wasteful number, since it uses less digits than its factorization.

775839540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 48.

The square root of 775839540 is about 27853.8963163145. The cubic root of 775839540 is about 918.8768350971.

The spelling of 775839540 in words is "seven hundred seventy-five million, eight hundred thirty-nine thousand, five hundred forty".