781665468 has 24 divisors (see below), whose sum is σ = 1853787600. Its totient is φ = 256283520.

The previous prime is 781665463. The next prime is 781665499. The reversal of 781665468 is 864566187.

It is a super-2 number, since 2×781665468² = 1222001807727318048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781665468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781665461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533193 + ... + 534656.

It is an arithmetic number, because the mean of its divisors is an integer number (77241150).

Almost surely, 2^781665468 is an apocalyptic number.

It is an amenable number.

781665468 is an abundant number, since it is smaller than the sum of its proper divisors (1072122132).

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

781665468 is a wasteful number, since it uses less digits than its factorization.

781665468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067917 (or 1067915 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 781665468 is about 27958.2808484356. The cubic root of 781665468 is about 921.1711094287.

The spelling of 781665468 in words is "seven hundred eighty-one million, six hundred sixty-five thousand, four hundred sixty-eight".