816870878 has 4 divisors (see below), whose sum is σ = 1225306320. Its totient is φ = 408435438.

The previous prime is 816870877. The next prime is 816870889. The reversal of 816870878 is 878078618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816870877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204217718 + ... + 204217721.

It is an arithmetic number, because the mean of its divisors is an integer number (306326580).

Almost surely, 2^816870878 is an apocalyptic number.

816870878 is a deficient number, since it is larger than the sum of its proper divisors (408435442).

816870878 is a wasteful number, since it uses less digits than its factorization.

816870878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408435441.

The product of its (nonzero) digits is 1204224, while the sum is 53.

The square root of 816870878 is about 28580.9530631853. The cubic root of 816870878 is about 934.7980644289.

The spelling of 816870878 in words is "eight hundred sixteen million, eight hundred seventy thousand, eight hundred seventy-eight".