813444887 has 12 divisors (see below), whose sum is σ = 852155304. Its totient is φ = 776426640.

The previous prime is 813444847. The next prime is 813444911. The reversal of 813444887 is 788444318.

It is not a de Polignac number, because 813444887 - 2⁶ = 813444823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813444847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300713 + ... + 303405.

It is an arithmetic number, because the mean of its divisors is an integer number (71012942).

Almost surely, 2^813444887 is an apocalyptic number.

813444887 is a deficient number, since it is larger than the sum of its proper divisors (38710417).

813444887 is a wasteful number, since it uses less digits than its factorization.

813444887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310 (or 3287 counting only the distinct ones).

The product of its digits is 688128, while the sum is 47.

The square root of 813444887 is about 28520.9552259387. The cubic root of 813444887 is about 933.4893722814.

The spelling of 813444887 in words is "eight hundred thirteen million, four hundred forty-four thousand, eight hundred eighty-seven".