813400008 has 32 divisors (see below), whose sum is σ = 2088461760. Its totient is φ = 263805120.

The previous prime is 813399967. The next prime is 813400057. The reversal of 813400008 is 800004318.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 457108 + ... + 458883.

It is an arithmetic number, because the mean of its divisors is an integer number (65264430).

Almost surely, 2^813400008 is an apocalyptic number.

It is an amenable number.

813400008 is an abundant number, since it is smaller than the sum of its proper divisors (1275061752).

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

813400008 is a wasteful number, since it uses less digits than its factorization.

813400008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916037 (or 916033 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 813400008 is about 28520.1684427003. The cubic root of 813400008 is about 933.4722046197.

The spelling of 813400008 in words is "eight hundred thirteen million, four hundred thousand, eight".