85640045 has 16 divisors (see below), whose sum is σ = 106738560. Its totient is φ = 65884224.

The previous prime is 85639993. The next prime is 85640057. The reversal of 85640045 is 54004658.

It is a cyclic number.

It is not a de Polignac number, because 85640045 - 2¹⁶ = 85574509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 85639993 and 85640020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39992 + ... + 42078.

It is an arithmetic number, because the mean of its divisors is an integer number (6671160).

Almost surely, 2^85640045 is an apocalyptic number.

It is an amenable number.

85640045 is a deficient number, since it is larger than the sum of its proper divisors (21098515).

85640045 is a wasteful number, since it uses less digits than its factorization.

85640045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 85640045 is about 9254.1906723387. The cubic root of 85640045 is about 440.7838043688.

The spelling of 85640045 in words is "eighty-five million, six hundred forty thousand, forty-five".