85653621 has 12 divisors (see below), whose sum is σ = 124053280. Its totient is φ = 56949480.

The previous prime is 85653583. The next prime is 85653637. The reversal of 85653621 is 12635658.

It is not a de Polignac number, because 85653621 - 2⁷ = 85653493 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 (85653641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9145 + ... + 15966.

Almost surely, 2^85653621 is an apocalyptic number.

It is an amenable number.

85653621 is a deficient number, since it is larger than the sum of its proper divisors (38399659).

85653621 is a wasteful number, since it uses less digits than its factorization.

85653621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25496 (or 25493 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 85653621 is about 9254.9241487978. The cubic root of 85653621 is about 440.8070947378.

The spelling of 85653621 in words is "eighty-five million, six hundred fifty-three thousand, six hundred twenty-one".