813651936 has 48 divisors (see below), whose sum is σ = 2139508224. Its totient is φ = 270751104.

The previous prime is 813651931. The next prime is 813651959. The reversal of 813651936 is 639156318.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813651931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51291 + ... + 65253.

It is an arithmetic number, because the mean of its divisors is an integer number (44573088).

Almost surely, 2^813651936 is an apocalyptic number.

It is an amenable number.

813651936 is an abundant number, since it is smaller than the sum of its proper divisors (1325856288).

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

813651936 is a wasteful number, since it uses less digits than its factorization.

813651936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583 (or 14575 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 813651936 is about 28524.5847647253. The cubic root of 813651936 is about 933.5685670115.

The spelling of 813651936 in words is "eight hundred thirteen million, six hundred fifty-one thousand, nine hundred thirty-six".