774488640 has 112 divisors (see below), whose sum is σ = 2588483520. Its totient is φ = 195655680.

The previous prime is 774488623. The next prime is 774488653. The reversal of 774488640 is 46884477.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 774488640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2991 + ... + 39470.

It is an arithmetic number, because the mean of its divisors is an integer number (23111460).

Almost surely, 2^774488640 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 774488640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294241760).

774488640 is an abundant number, since it is smaller than the sum of its proper divisors (1813994880).

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

774488640 is a wasteful number, since it uses less digits than its factorization.

774488640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42500 (or 42490 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 48.

The square root of 774488640 is about 27829.6360019315. The cubic root of 774488640 is about 918.3432059073.

The spelling of 774488640 in words is "seven hundred seventy-four million, four hundred eighty-eight thousand, six hundred forty".