820449524 has 12 divisors (see below), whose sum is σ = 1470806148. Its totient is φ = 400219200.

The previous prime is 820449499. The next prime is 820449541. The reversal of 820449524 is 425944028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 241180900 + 579268624 = 15530^2 + 24068^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501207 + ... + 2501534.

It is an arithmetic number, because the mean of its divisors is an integer number (122567179).

Almost surely, 2^820449524 is an apocalyptic number.

It is an amenable number.

820449524 is a deficient number, since it is larger than the sum of its proper divisors (650356624).

820449524 is a wasteful number, since it uses less digits than its factorization.

820449524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002786 (or 5002784 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 820449524 is about 28643.4900806449. The cubic root of 820449524 is about 936.1611676719.

The spelling of 820449524 in words is "eight hundred twenty million, four hundred forty-nine thousand, five hundred twenty-four".