825220615 has 8 divisors (see below), whose sum is σ = 992564928. Its totient is φ = 658643040.

The previous prime is 825220573. The next prime is 825220619. The reversal of 825220615 is 516022528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 825220615 - 2²¹ = 823123463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825220619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189312 + ... + 193621.

It is an arithmetic number, because the mean of its divisors is an integer number (124070616).

Almost surely, 2^825220615 is an apocalyptic number.

825220615 is a deficient number, since it is larger than the sum of its proper divisors (167344313).

825220615 is a wasteful number, since it uses less digits than its factorization.

825220615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383369.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 825220615 is about 28726.6533901880. The cubic root of 825220615 is about 937.9723211706.

The spelling of 825220615 in words is "eight hundred twenty-five million, two hundred twenty thousand, six hundred fifteen".