813403880 has 16 divisors (see below), whose sum is σ = 1830158820. Its totient is φ = 325361536.

The previous prime is 813403853. The next prime is 813403883. The reversal of 813403880 is 88304318.

It can be written as a sum of positive squares in 2 ways, for example, as 812136004 + 1267876 = 28498^2 + 1126^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 813403880.

It is not an unprimeable number, because it can be changed into a prime (813403883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10167509 + ... + 10167588.

Almost surely, 2^813403880 is an apocalyptic number.

It is an amenable number.

813403880 is an abundant number, since it is smaller than the sum of its proper divisors (1016754940).

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

813403880 is a wasteful number, since it uses less digits than its factorization.

813403880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20335108 (or 20335104 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 813403880 is about 28520.2363244066. The cubic root of 813403880 is about 933.4736858092.

The spelling of 813403880 in words is "eight hundred thirteen million, four hundred three thousand, eight hundred eighty".