85909731 has 8 divisors (see below), whose sum is σ = 115926720. Its totient is φ = 56582952.

The previous prime is 85909727. The next prime is 85909741. The reversal of 85909731 is 13790958.

It is a happy number.

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

It is not a de Polignac number, because 85909731 - 2² = 85909727 is a prime.

It is a super-2 number, since 2×85909731² = 14760963760984722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85909741) 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, 172261 + ... + 172758.

It is an arithmetic number, because the mean of its divisors is an integer number (14490840).

Almost surely, 2^85909731 is an apocalyptic number.

85909731 is a deficient number, since it is larger than the sum of its proper divisors (30016989).

85909731 is a wasteful number, since it uses less digits than its factorization.

85909731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345105.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 85909731 is about 9268.7502393796. The cubic root of 85909731 is about 441.2460050410.

The spelling of 85909731 in words is "eighty-five million, nine hundred nine thousand, seven hundred thirty-one".