85437257 has 4 divisors (see below), whose sum is σ = 90462996. Its totient is φ = 80411520.

The previous prime is 85437239. The next prime is 85437269. The reversal of 85437257 is 75273458.

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 54479161 + 30958096 = 7381^2 + 5564^2 .

It is a cyclic number.

It is not a de Polignac number, because 85437257 - 2⁶ = 85437193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85437217) 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, 2512844 + ... + 2512877.

It is an arithmetic number, because the mean of its divisors is an integer number (22615749).

Almost surely, 2^85437257 is an apocalyptic number.

It is an amenable number.

85437257 is a deficient number, since it is larger than the sum of its proper divisors (5025739).

85437257 is a wasteful number, since it uses less digits than its factorization.

85437257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025738.

The product of its digits is 235200, while the sum is 41.

The square root of 85437257 is about 9243.2276289184. The cubic root of 85437257 is about 440.4356171335.

The spelling of 85437257 in words is "eighty-five million, four hundred thirty-seven thousand, two hundred fifty-seven".