84845709 has 24 divisors (see below), whose sum is σ = 133213080. Its totient is φ = 51725952.

The previous prime is 84845707. The next prime is 84845731. The reversal of 84845709 is 90754848.

It can be written as a sum of positive squares in 4 ways, for example, as 21609 + 84824100 = 147^2 + 9210^2 .

It is not a de Polignac number, because 84845709 - 2¹ = 84845707 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84845707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9427 + ... + 16079.

It is an arithmetic number, because the mean of its divisors is an integer number (5550545).

Almost surely, 2^84845709 is an apocalyptic number.

It is an amenable number.

84845709 is a deficient number, since it is larger than the sum of its proper divisors (48367371).

84845709 is a wasteful number, since it uses less digits than its factorization.

84845709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781 (or 6778 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 84845709 is about 9211.1730523316. The cubic root of 84845709 is about 439.4167703018.

The spelling of 84845709 in words is "eighty-four million, eight hundred forty-five thousand, seven hundred nine".