781060240 has 40 divisors (see below), whose sum is σ = 1922789880. Its totient is φ = 294045696.

The previous prime is 781060193. The next prime is 781060253. The reversal of 781060240 is 42060187.

It can be written as a sum of positive squares in 4 ways, for example, as 170772624 + 610287616 = 13068^2 + 24704^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×781060240² = 1220110197017715200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781060199 and 781060208.

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 7 ways as a sum of consecutive naturals, for example, 285795 + ... + 288514.

It is an arithmetic number, because the mean of its divisors is an integer number (48069747).

Almost surely, 2^781060240 is an apocalyptic number.

It is an amenable number.

781060240 is an abundant number, since it is smaller than the sum of its proper divisors (1141729640).

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

781060240 is a wasteful number, since it uses less digits than its factorization.

781060240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574339 (or 574333 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 781060240 is about 27947.4549825203. The cubic root of 781060240 is about 920.9332998947.

The spelling of 781060240 in words is "seven hundred eighty-one million, sixty thousand, two hundred forty".