85373639 has 4 divisors (see below), whose sum is σ = 91940856. Its totient is φ = 78806424.

The previous prime is 85373633. The next prime is 85373653. The reversal of 85373639 is 93637358.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85373639 - 2⁴ = 85373623 is a prime.

It is a super-2 number, since 2×85373639² = 14577316472204642, which contains 22 as substring.

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 85373639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85373633) 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, 3283589 + ... + 3283614.

It is an arithmetic number, because the mean of its divisors is an integer number (22985214).

Almost surely, 2^85373639 is an apocalyptic number.

85373639 is a deficient number, since it is larger than the sum of its proper divisors (6567217).

85373639 is a wasteful number, since it uses less digits than its factorization.

85373639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6567216.

The product of its digits is 408240, while the sum is 44.

The square root of 85373639 is about 9239.7856576871. The cubic root of 85373639 is about 440.3262714312.

The spelling of 85373639 in words is "eighty-five million, three hundred seventy-three thousand, six hundred thirty-nine".