878784761 has 4 divisors (see below), whose sum is σ = 880532352. Its totient is φ = 877037172.

The previous prime is 878784677. The next prime is 878784779. The reversal of 878784761 is 167487878.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-878784761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 878784697 and 878784706.

It is not an unprimeable number, because it can be changed into a prime (878784061) 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, 873041 + ... + 874046.

It is an arithmetic number, because the mean of its divisors is an integer number (220133088).

Almost surely, 2^878784761 is an apocalyptic number.

It is an amenable number.

878784761 is a deficient number, since it is larger than the sum of its proper divisors (1747591).

878784761 is a wasteful number, since it uses less digits than its factorization.

878784761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747590.

The product of its digits is 4214784, while the sum is 56.

The square root of 878784761 is about 29644.3040228642. The cubic root of 878784761 is about 957.8426530311.

The spelling of 878784761 in words is "eight hundred seventy-eight million, seven hundred eighty-four thousand, seven hundred sixty-one".