85440637 has 4 divisors (see below), whose sum is σ = 85465116. Its totient is φ = 85416160.

The previous prime is 85440601. The next prime is 85440661. The reversal of 85440637 is 73604458.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32936121 + 52504516 = 5739^2 + 7246^2 .

It is a cyclic number.

It is not a de Polignac number, because 85440637 - 2¹¹ = 85438589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85440596 and 85440605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85440697) 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, 5914 + ... + 14347.

It is an arithmetic number, because the mean of its divisors is an integer number (21366279).

Almost surely, 2^85440637 is an apocalyptic number.

It is an amenable number.

85440637 is a deficient number, since it is larger than the sum of its proper divisors (24479).

85440637 is a wasteful number, since it uses less digits than its factorization.

85440637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24478.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 85440637 is about 9243.4104636763. The cubic root of 85440637 is about 440.4414251100.

The spelling of 85440637 in words is "eighty-five million, four hundred forty thousand, six hundred thirty-seven".