820449012 has 12 divisors (see below), whose sum is σ = 1914381056. Its totient is φ = 273483000.

The previous prime is 820449011. The next prime is 820449037. The reversal of 820449012 is 210944028.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×820449012² = 1346273162583552288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820449011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34185364 + ... + 34185387.

Almost surely, 2^820449012 is an apocalyptic number.

It is an amenable number.

820449012 is an abundant number, since it is smaller than the sum of its proper divisors (1093932044).

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

820449012 is a wasteful number, since it uses less digits than its factorization.

820449012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68370758 (or 68370756 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 820449012 is about 28643.4811431851. The cubic root of 820449012 is about 936.1609729353.

The spelling of 820449012 in words is "eight hundred twenty million, four hundred forty-nine thousand, twelve".