781305132 has 18 divisors (see below), whose sum is σ = 1823271268. Its totient is φ = 260402768.

The previous prime is 781305127. The next prime is 781305139. The reversal of 781305132 is 231503187.

It is a super-2 number, since 2×781305132² = 1220875418579074848, 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 781305132.

It is not an unprimeable number, because it can be changed into a prime (781305139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92794 + ... + 100862.

Almost surely, 2^781305132 is an apocalyptic number.

It is an amenable number.

781305132 is an abundant number, since it is smaller than the sum of its proper divisors (1041966136).

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

781305132 is an frugal number, since it uses more digits than its factorization.

781305132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16145 (or 8074 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 781305132 is about 27951.8359325465. The cubic root of 781305132 is about 921.0295390065.

The spelling of 781305132 in words is "seven hundred eighty-one million, three hundred five thousand, one hundred thirty-two".