775261640 has 64 divisors (see below), whose sum is σ = 1862784000. Its totient is φ = 289739520.

The previous prime is 775261639. The next prime is 775261649. The reversal of 775261640 is 46162577.

775261640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×775261640² = 1202061220910979200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 775261594 and 775261603.

It is not an unprimeable number, because it can be changed into a prime (775261649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25181 + ... + 46739.

It is an arithmetic number, because the mean of its divisors is an integer number (29106000).

Almost surely, 2^775261640 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 775261640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931392000).

775261640 is an abundant number, since it is smaller than the sum of its proper divisors (1087522360).

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

775261640 is a wasteful number, since it uses less digits than its factorization.

775261640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21630 (or 21626 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 775261640 is about 27843.5206107274. The cubic root of 775261640 is about 918.6486303387.

The spelling of 775261640 in words is "seven hundred seventy-five million, two hundred sixty-one thousand, six hundred forty".