85644049 has 4 divisors (see below), whose sum is σ = 85662720. Its totient is φ = 85625380.

The previous prime is 85644017. The next prime is 85644059. The reversal of 85644049 is 94044658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94044658 = 2 ⋅47022329.

It is a cyclic number.

It is not a de Polignac number, because 85644049 - 2⁵ = 85644017 is a prime.

It is a super-2 number, since 2×85644049² = 14669806258228802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85644059) 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, 2832 + ... + 13390.

It is an arithmetic number, because the mean of its divisors is an integer number (21415680).

Almost surely, 2^85644049 is an apocalyptic number.

It is an amenable number.

85644049 is a deficient number, since it is larger than the sum of its proper divisors (18671).

85644049 is a wasteful number, since it uses less digits than its factorization.

85644049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18670.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 85644049 is about 9254.4070042332. The cubic root of 85644049 is about 440.7906737053.

The spelling of 85644049 in words is "eighty-five million, six hundred forty-four thousand, forty-nine".