85364721 has 12 divisors (see below), whose sum is σ = 132789748. Its totient is φ = 52532064.

The previous prime is 85364711. The next prime is 85364723. The reversal of 85364721 is 12746358.

85364721 is a `hidden beast` number, since 8 + 5 + 3 + 647 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 33005025 + 52359696 = 5745^2 + 7236^2 .

It is not a de Polignac number, because 85364721 - 2⁷ = 85364593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85364723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364690 + ... + 364923.

Almost surely, 2^85364721 is an apocalyptic number.

It is an amenable number.

85364721 is a deficient number, since it is larger than the sum of its proper divisors (47425027).

85364721 is a wasteful number, since it uses less digits than its factorization.

85364721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729632 (or 729629 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 85364721 is about 9239.3030581316. The cubic root of 85364721 is about 440.3109389606.

The spelling of 85364721 in words is "eighty-five million, three hundred sixty-four thousand, seven hundred twenty-one".