64857157 has 4 divisors (see below), whose sum is σ = 64883500. Its totient is φ = 64830816.

The previous prime is 64857119. The next prime is 64857161. The reversal of 64857157 is 75175846.

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 6395841 + 58461316 = 2529^2 + 7646^2 .

It is a cyclic number.

It is not a de Polignac number, because 64857157 - 2¹⁹ = 64332869 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 (64857257) 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, 9048 + ... + 14545.

It is an arithmetic number, because the mean of its divisors is an integer number (16220875).

Almost surely, 2^64857157 is an apocalyptic number.

It is an amenable number.

64857157 is a deficient number, since it is larger than the sum of its proper divisors (26343).

64857157 is a wasteful number, since it uses less digits than its factorization.

64857157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26342.

The product of its digits is 235200, while the sum is 43.

The square root of 64857157 is about 8053.3941291855. The cubic root of 64857157 is about 401.7778303416. Note that the first 3 decimals are identical.

The spelling of 64857157 in words is "sixty-four million, eight hundred fifty-seven thousand, one hundred fifty-seven".