813887970 has 64 divisors (see below), whose sum is σ = 2234704896. Its totient is φ = 185837760.

The previous prime is 813887969. The next prime is 813888011. The reversal of 813887970 is 79788318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328677 + ... + 331143.

It is an arithmetic number, because the mean of its divisors is an integer number (34917264).

Almost surely, 2^813887970 is an apocalyptic number.

813887970 is an abundant number, since it is smaller than the sum of its proper divisors (1420816926).

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

813887970 is a wasteful number, since it uses less digits than its factorization.

813887970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055.

The product of its (nonzero) digits is 677376, while the sum is 51.

The square root of 813887970 is about 28528.7218430830. The cubic root of 813887970 is about 933.6588319062.

The spelling of 813887970 in words is "eight hundred thirteen million, eight hundred eighty-seven thousand, nine hundred seventy".