825734781 has 12 divisors (see below), whose sum is σ = 1207826880. Its totient is φ = 543521160.

The previous prime is 825734773. The next prime is 825734783. The reversal of 825734781 is 187437528.

825734781 is a `hidden beast` number, since 8 + 2 + 573 + 4 + 78 + 1 = 666.

It is not a de Polignac number, because 825734781 - 2³ = 825734773 is a prime.

It is a super-2 number, since 2×825734781² = 1363675857106235922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825734783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 579975 + ... + 581396.

It is an arithmetic number, because the mean of its divisors is an integer number (100652240).

Almost surely, 2^825734781 is an apocalyptic number.

It is an amenable number.

825734781 is a deficient number, since it is larger than the sum of its proper divisors (382092099).

825734781 is a wasteful number, since it uses less digits than its factorization.

825734781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161456 (or 1161453 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 825734781 is about 28735.6012813374. The cubic root of 825734781 is about 938.1670866026.

The spelling of 825734781 in words is "eight hundred twenty-five million, seven hundred thirty-four thousand, seven hundred eighty-one".