825722420 has 24 divisors (see below), whose sum is σ = 1753504200. Its totient is φ = 326577152.

The previous prime is 825722407. The next prime is 825722437. The reversal of 825722420 is 24227528.

It can be written as a sum of positive squares in 4 ways, for example, as 32398864 + 793323556 = 5692^2 + 28166^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230165 + ... + 233724.

It is an arithmetic number, because the mean of its divisors is an integer number (73062675).

Almost surely, 2^825722420 is an apocalyptic number.

It is an amenable number.

825722420 is an abundant number, since it is smaller than the sum of its proper divisors (927781780).

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

825722420 is a wasteful number, since it uses less digits than its factorization.

825722420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463987 (or 463985 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 825722420 is about 28735.3861989012. The cubic root of 825722420 is about 938.1624052200.

Adding to 825722420 its reverse (24227528), we get a palindrome (849949948).

The spelling of 825722420 in words is "eight hundred twenty-five million, seven hundred twenty-two thousand, four hundred twenty".