85929721 has 4 divisors (see below), whose sum is σ = 86498944. Its totient is φ = 85360500.

The previous prime is 85929719. The next prime is 85929743. The reversal of 85929721 is 12792958.

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.

It is a cyclic number.

It is not a de Polignac number, because 85929721 - 2¹ = 85929719 is a prime.

It is a super-2 number, since 2×85929721² = 14767833902275682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85929791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284385 + ... + 284686.

It is an arithmetic number, because the mean of its divisors is an integer number (21624736).

Almost surely, 2^85929721 is an apocalyptic number.

It is an amenable number.

85929721 is a deficient number, since it is larger than the sum of its proper divisors (569223).

85929721 is a wasteful number, since it uses less digits than its factorization.

85929721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569222.

The product of its digits is 90720, while the sum is 43.

The square root of 85929721 is about 9269.8285313160. The cubic root of 85929721 is about 441.2802263238.

The spelling of 85929721 in words is "eighty-five million, nine hundred twenty-nine thousand, seven hundred twenty-one".