813779655 has 64 divisors (see below), whose sum is σ = 1434854400. Its totient is φ = 391412736.

The previous prime is 813779651. The next prime is 813779669. The reversal of 813779655 is 556977318.

It is not a de Polignac number, because 813779655 - 2² = 813779651 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

Its product of digits (1587600) is a multiple of the sum of its prime divisors (600).

It is a junction number, because it is equal to n+sod(n) for n = 813779598 and 813779607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813779651) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2599779 + ... + 2600091.

It is an arithmetic number, because the mean of its divisors is an integer number (22419600).

Almost surely, 2^813779655 is an apocalyptic number.

813779655 is a deficient number, since it is larger than the sum of its proper divisors (621074745).

813779655 is a wasteful number, since it uses less digits than its factorization.

813779655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its digits is 1587600, while the sum is 51.

The square root of 813779655 is about 28526.8234298879. The cubic root of 813779655 is about 933.6174118964.

The spelling of 813779655 in words is "eight hundred thirteen million, seven hundred seventy-nine thousand, six hundred fifty-five".