858780847 has 4 divisors (see below), whose sum is σ = 868430160. Its totient is φ = 849131536.

The previous prime is 858780809. The next prime is 858780859. The reversal of 858780847 is 748087858.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-858780847 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 (858780887) 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, 4824523 + ... + 4824700.

It is an arithmetic number, because the mean of its divisors is an integer number (217107540).

Almost surely, 2^858780847 is an apocalyptic number.

858780847 is a deficient number, since it is larger than the sum of its proper divisors (9649313).

858780847 is an equidigital number, since it uses as much as digits as its factorization.

858780847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9649312.

The product of its (nonzero) digits is 4014080, while the sum is 55.

The square root of 858780847 is about 29304.9628390824. The cubic root of 858780847 is about 950.5189581921.

The spelling of 858780847 in words is "eight hundred fifty-eight million, seven hundred eighty thousand, eight hundred forty-seven".