878042477 has 4 divisors (see below), whose sum is σ = 945584220. Its totient is φ = 810500736.

The previous prime is 878042447. The next prime is 878042489. The reversal of 878042477 is 774240878.

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

It can be written as a sum of positive squares in 2 ways, for example, as 121462441 + 756580036 = 11021^2 + 27506^2 .

It is a cyclic number.

It is not a de Polignac number, because 878042477 - 2²⁴ = 861265261 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 (878042447) 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, 33770852 + ... + 33770877.

It is an arithmetic number, because the mean of its divisors is an integer number (236396055).

Almost surely, 2^878042477 is an apocalyptic number.

It is an amenable number.

878042477 is a deficient number, since it is larger than the sum of its proper divisors (67541743).

878042477 is a wasteful number, since it uses less digits than its factorization.

878042477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67541742.

The product of its (nonzero) digits is 702464, while the sum is 47.

The square root of 878042477 is about 29631.7815360467. The cubic root of 878042477 is about 957.5728897602.

The spelling of 878042477 in words is "eight hundred seventy-eight million, forty-two thousand, four hundred seventy-seven".