781534425 has 48 divisors (see below), whose sum is σ = 1483297920. Its totient is φ = 355683840.

The previous prime is 781534399. The next prime is 781534463. The reversal of 781534425 is 524435187.

781534425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 781534425 - 2⁹ = 781533913 is a prime.

It is a super-2 number, since 2×781534425² = 1221592114920161250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119131 + ... + 125519.

It is an arithmetic number, because the mean of its divisors is an integer number (30902040).

Almost surely, 2^781534425 is an apocalyptic number.

781534425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

781534425 is a deficient number, since it is larger than the sum of its proper divisors (701763495).

781534425 is a wasteful number, since it uses less digits than its factorization.

781534425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642 (or 6637 counting only the distinct ones).

The product of its digits is 134400, while the sum is 39.

The square root of 781534425 is about 27955.9372048229. The cubic root of 781534425 is about 921.1196297028.

The spelling of 781534425 in words is "seven hundred eighty-one million, five hundred thirty-four thousand, four hundred twenty-five".