813540008 has 8 divisors (see below), whose sum is σ = 1525387530. Its totient is φ = 406770000.

The previous prime is 813539989. The next prime is 813540023. The reversal of 813540008 is 800045318.

It can be written as a sum of positive squares in only one way, i.e., 443439364 + 370100644 = 21058^2 + 19238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50846243 + ... + 50846258.

Almost surely, 2^813540008 is an apocalyptic number.

It is an amenable number.

813540008 is a deficient number, since it is larger than the sum of its proper divisors (711847522).

813540008 is a wasteful number, since it uses less digits than its factorization.

813540008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101692507 (or 101692503 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 813540008 is about 28522.6227405546. The cubic root of 813540008 is about 933.5257570376.

The spelling of 813540008 in words is "eight hundred thirteen million, five hundred forty thousand, eight".