812417820 has 24 divisors (see below), whose sum is σ = 2274770064. Its totient is φ = 216644736.

The previous prime is 812417819. The next prime is 812417839. The reversal of 812417820 is 28714218.

It is a happy number.

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, 6770089 + ... + 6770208.

It is an arithmetic number, because the mean of its divisors is an integer number (94782086).

Almost surely, 2^812417820 is an apocalyptic number.

It is an amenable number.

812417820 is an abundant number, since it is smaller than the sum of its proper divisors (1462352244).

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

812417820 is a wasteful number, since it uses less digits than its factorization.

812417820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13540309 (or 13540307 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 812417820 is about 28502.9440584653. The cubic root of 812417820 is about 933.0963278598.

The spelling of 812417820 in words is "eight hundred twelve million, four hundred seventeen thousand, eight hundred twenty".