825788781 has 24 divisors (see below), whose sum is σ = 1219755264. Its totient is φ = 538198560.

The previous prime is 825788771. The next prime is 825788791. The reversal of 825788781 is 187887528.

It is an interprime number because it is at equal distance from previous prime (825788771) and next prime (825788791).

It is not a de Polignac number, because 825788781 - 2¹⁰ = 825787757 is a prime.

It is a super-2 number, since 2×825788781² = 1363854221650931922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825788741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87180 + ... + 96186.

It is an arithmetic number, because the mean of its divisors is an integer number (50823136).

Almost surely, 2^825788781 is an apocalyptic number.

It is an amenable number.

825788781 is a deficient number, since it is larger than the sum of its proper divisors (393966483).

825788781 is a wasteful number, since it uses less digits than its factorization.

825788781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241 (or 9238 counting only the distinct ones).

The product of its digits is 2007040, while the sum is 54.

The square root of 825788781 is about 28736.5408669868. The cubic root of 825788781 is about 938.1875370424.

The spelling of 825788781 in words is "eight hundred twenty-five million, seven hundred eighty-eight thousand, seven hundred eighty-one".