85079721 has 4 divisors (see below), whose sum is σ = 113439632. Its totient is φ = 56719812.

The previous prime is 85079677. The next prime is 85079759. The reversal of 85079721 is 12797058.

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 not a de Polignac number, because 85079721 - 2²¹ = 82982569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85079721.

It is not an unprimeable number, because it can be changed into a prime (85079791) 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, 14179951 + ... + 14179956.

It is an arithmetic number, because the mean of its divisors is an integer number (28359908).

Almost surely, 2^85079721 is an apocalyptic number.

It is an amenable number.

85079721 is a deficient number, since it is larger than the sum of its proper divisors (28359911).

85079721 is a wasteful number, since it uses less digits than its factorization.

85079721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28359910.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 85079721 is about 9223.8669222837. The cubic root of 85079721 is about 439.8203829538.

The spelling of 85079721 in words is "eighty-five million, seventy-nine thousand, seven hundred twenty-one".