85279781 has 8 divisors (see below), whose sum is σ = 86628864. Its totient is φ = 83940480.

The previous prime is 85279763. The next prime is 85279787. The reversal of 85279781 is 18797258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85279781 - 2¹⁰ = 85278757 is a prime.

It is a super-2 number, since 2×85279781² = 14545282094815922, 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 (85279787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16226 + ... + 20828.

It is an arithmetic number, because the mean of its divisors is an integer number (10828608).

Almost surely, 2^85279781 is an apocalyptic number.

It is an amenable number.

85279781 is a deficient number, since it is larger than the sum of its proper divisors (1349083).

85279781 is a wasteful number, since it uses less digits than its factorization.

85279781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891.

The product of its digits is 282240, while the sum is 47.

The square root of 85279781 is about 9234.7052470558. The cubic root of 85279781 is about 440.1648504195.

The spelling of 85279781 in words is "eighty-five million, two hundred seventy-nine thousand, seven hundred eighty-one".