845640047 has 16 divisors (see below), whose sum is σ = 991872000. Its totient is φ = 705831360.

The previous prime is 845640043. The next prime is 845640067. The reversal of 845640047 is 740046548.

It is a cyclic number.

It is not a de Polignac number, because 845640047 - 2² = 845640043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845640043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169454 + ... + 174372.

It is an arithmetic number, because the mean of its divisors is an integer number (61992000).

Almost surely, 2^845640047 is an apocalyptic number.

845640047 is a deficient number, since it is larger than the sum of its proper divisors (146231953).

845640047 is a wasteful number, since it uses less digits than its factorization.

845640047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5566.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 845640047 is about 29079.8907666449. The cubic root of 845640047 is about 945.6458345681.

The spelling of 845640047 in words is "eight hundred forty-five million, six hundred forty thousand, forty-seven".