823778225 has 12 divisors (see below), whose sum is σ = 1026839040. Its totient is φ = 655568400.

The previous prime is 823778213. The next prime is 823778239. The reversal of 823778225 is 522877328.

It is not a de Polignac number, because 823778225 - 2⁶ = 823778161 is a prime.

It is a super-2 number, since 2×823778225² = 1357221127968301250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81485 + ... + 91034.

It is an arithmetic number, because the mean of its divisors is an integer number (85569920).

Almost surely, 2^823778225 is an apocalyptic number.

It is an amenable number.

823778225 is a deficient number, since it is larger than the sum of its proper divisors (203060815).

823778225 is a wasteful number, since it uses less digits than its factorization.

823778225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172720 (or 172715 counting only the distinct ones).

The product of its digits is 376320, while the sum is 44.

The square root of 823778225 is about 28701.5369797508. The cubic root of 823778225 is about 937.4255134894.

The spelling of 823778225 in words is "eight hundred twenty-three million, seven hundred seventy-eight thousand, two hundred twenty-five".