85720549 has 16 divisors (see below), whose sum is σ = 92574720. Its totient is φ = 79188480.

The previous prime is 85720519. The next prime is 85720553. The reversal of 85720549 is 94502758.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85720549 is a prime.

It is a super-2 number, since 2×85720549² = 14696025041722802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85720519) 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, 86712 + ... + 87694.

It is an arithmetic number, because the mean of its divisors is an integer number (5785920).

Almost surely, 2^85720549 is an apocalyptic number.

It is an amenable number.

85720549 is a deficient number, since it is larger than the sum of its proper divisors (6854171).

85720549 is a wasteful number, since it uses less digits than its factorization.

85720549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 85720549 is about 9258.5392476351. The cubic root of 85720549 is about 440.9218774174.

The spelling of 85720549 in words is "eighty-five million, seven hundred twenty thousand, five hundred forty-nine".