83643257 has 4 divisors (see below), whose sum is σ = 83663460. Its totient is φ = 83623056.

The previous prime is 83643253. The next prime is 83643283. The reversal of 83643257 is 75234638.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75234638 = 2 ⋅37617319.

It can be written as a sum of positive squares in 2 ways, for example, as 40819321 + 42823936 = 6389^2 + 6544^2 .

It is a cyclic number.

It is not a de Polignac number, because 83643257 - 2² = 83643253 is a prime.

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 83643257.

It is not an unprimeable number, because it can be changed into a prime (83643253) 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, 1382 + ... + 13007.

It is an arithmetic number, because the mean of its divisors is an integer number (20915865).

Almost surely, 2^83643257 is an apocalyptic number.

It is an amenable number.

83643257 is a deficient number, since it is larger than the sum of its proper divisors (20203).

83643257 is a wasteful number, since it uses less digits than its factorization.

83643257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20202.

The product of its digits is 120960, while the sum is 38.

The square root of 83643257 is about 9145.6687563021. The cubic root of 83643257 is about 437.3310489953.

The spelling of 83643257 in words is "eighty-three million, six hundred forty-three thousand, two hundred fifty-seven".