781672872 has 32 divisors (see below), whose sum is σ = 2001847680. Its totient is φ = 254202240.

The previous prime is 781672823. The next prime is 781672883. The reversal of 781672872 is 278276187.

It is a happy number.

781672872 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 2×781672872² = 1222024957641456768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396208 + ... + 398175.

It is an arithmetic number, because the mean of its divisors is an integer number (62557740).

Almost surely, 2^781672872 is an apocalyptic number.

It is an amenable number.

781672872 is an abundant number, since it is smaller than the sum of its proper divisors (1220174808).

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

781672872 is a wasteful number, since it uses less digits than its factorization.

781672872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794433 (or 794429 counting only the distinct ones).

The product of its digits is 526848, while the sum is 48.

The square root of 781672872 is about 27958.4132596970. The cubic root of 781672872 is about 921.1740178892.

The spelling of 781672872 in words is "seven hundred eighty-one million, six hundred seventy-two thousand, eight hundred seventy-two".