781985296 has 15 divisors (see below), whose sum is σ = 1515313263. Its totient is φ = 390936720.

The previous prime is 781985249. The next prime is 781985297. The reversal of 781985296 is 692589187.

The square root of 781985296 is 27964.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×781985296² = 1223002006320415232, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781985297) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 108361 + ... + 115351.

Almost surely, 2^781985296 is an apocalyptic number.

781985296 is the 27964-th square number.

It is an amenable number.

781985296 is a deficient number, since it is larger than the sum of its proper divisors (733327967).

781985296 is an frugal number, since it uses more digits than its factorization.

781985296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13990 (or 6993 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 55.

The cubic root of 781985296 is about 921.2967284447.

The spelling of 781985296 in words is "seven hundred eighty-one million, nine hundred eighty-five thousand, two hundred ninety-six".