813649892 has 24 divisors (see below), whose sum is σ = 1554124320. Its totient is φ = 369652160.

The previous prime is 813649873. The next prime is 813649931. The reversal of 813649892 is 298946318.

It is a happy number.

It is a super-2 number, since 2×813649892² = 1324052293503223328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813649892.

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, 118859 + ... + 125517.

It is an arithmetic number, because the mean of its divisors is an integer number (64755180).

Almost surely, 2^813649892 is an apocalyptic number.

It is an amenable number.

813649892 is a deficient number, since it is larger than the sum of its proper divisors (740474428).

813649892 is a wasteful number, since it uses less digits than its factorization.

813649892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451 (or 9449 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 813649892 is about 28524.5489359604. The cubic root of 813649892 is about 933.5677852621.

The spelling of 813649892 in words is "eight hundred thirteen million, six hundred forty-nine thousand, eight hundred ninety-two".