878437813 has 4 divisors (see below), whose sum is σ = 958295808. Its totient is φ = 798579820.

The previous prime is 878437801. The next prime is 878437837. The reversal of 878437813 is 318734878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 878437813 - 2²⁵ = 844883381 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 (878437853) 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, 39928981 + ... + 39929002.

It is an arithmetic number, because the mean of its divisors is an integer number (239573952).

Almost surely, 2^878437813 is an apocalyptic number.

It is an amenable number.

878437813 is a deficient number, since it is larger than the sum of its proper divisors (79857995).

878437813 is a wasteful number, since it uses less digits than its factorization.

878437813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79857994.

The product of its digits is 903168, while the sum is 49.

The square root of 878437813 is about 29638.4515958577. The cubic root of 878437813 is about 957.7165829734.

The spelling of 878437813 in words is "eight hundred seventy-eight million, four hundred thirty-seven thousand, eight hundred thirteen".