85723621 has 4 divisors (see below), whose sum is σ = 85763392. Its totient is φ = 85683852.

The previous prime is 85723613. The next prime is 85723633. The reversal of 85723621 is 12632758.

It is a happy number.

85723621 is nontrivially palindromic in base 14.

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 85723621 - 2³ = 85723613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85723321) 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, 16455 + ... + 21028.

It is an arithmetic number, because the mean of its divisors is an integer number (21440848).

Almost surely, 2^85723621 is an apocalyptic number.

It is an amenable number.

85723621 is a deficient number, since it is larger than the sum of its proper divisors (39771).

85723621 is a wasteful number, since it uses less digits than its factorization.

85723621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39770.

The product of its digits is 20160, while the sum is 34.

The square root of 85723621 is about 9258.7051470495. The cubic root of 85723621 is about 440.9271445163.

The spelling of 85723621 in words is "eighty-five million, seven hundred twenty-three thousand, six hundred twenty-one".