845420087 has 4 divisors (see below), whose sum is σ = 854135856. Its totient is φ = 836704320.

The previous prime is 845420021. The next prime is 845420117. The reversal of 845420087 is 780024548.

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

It is a cyclic number.

It is not a de Polignac number, because 845420087 - 2⁸ = 845419831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 845420087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845420987) 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, 4357739 + ... + 4357932.

It is an arithmetic number, because the mean of its divisors is an integer number (213533964).

Almost surely, 2^845420087 is an apocalyptic number.

845420087 is a deficient number, since it is larger than the sum of its proper divisors (8715769).

845420087 is an equidigital number, since it uses as much as digits as its factorization.

845420087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8715768.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 845420087 is about 29076.1085257295. The cubic root of 845420087 is about 945.5638366007.

The spelling of 845420087 in words is "eight hundred forty-five million, four hundred twenty thousand, eighty-seven".