786775640 has 128 divisors (see below), whose sum is σ = 2174999040. Its totient is φ = 249993216.

The previous prime is 786775631. The next prime is 786775643. The reversal of 786775640 is 46577687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (786775643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317687 + ... + 320153.

It is an arithmetic number, because the mean of its divisors is an integer number (16992180).

Almost surely, 2^786775640 is an apocalyptic number.

786775640 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 786775640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087499520).

786775640 is an abundant number, since it is smaller than the sum of its proper divisors (1388223400).

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

786775640 is a wasteful number, since it uses less digits than its factorization.

786775640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569 (or 2565 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 50.

The square root of 786775640 is about 28049.5212080349. The cubic root of 786775640 is about 923.1741494954.

The spelling of 786775640 in words is "seven hundred eighty-six million, seven hundred seventy-five thousand, six hundred forty".