781497468 has 18 divisors (see below), whose sum is σ = 1975452024. Its totient is φ = 260499144.

The previous prime is 781497449. The next prime is 781497517. The reversal of 781497468 is 864794187.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×781497468² = 1221476584980822048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10854096 + ... + 10854167.

Almost surely, 2^781497468 is an apocalyptic number.

It is an amenable number.

781497468 is an abundant number, since it is smaller than the sum of its proper divisors (1193954556).

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

781497468 is a wasteful number, since it uses less digits than its factorization.

781497468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21708273 (or 21708268 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 781497468 is about 27955.2762104044. The cubic root of 781497468 is about 921.1051102508.

The spelling of 781497468 in words is "seven hundred eighty-one million, four hundred ninety-seven thousand, four hundred sixty-eight".