665735238 has 48 divisors (see below), whose sum is σ = 1664840736. Its totient is φ = 188323200.

The previous prime is 665735237. The next prime is 665735251. The reversal of 665735238 is 832537566.

It is a super-2 number, since 2×665735238² = 886406814229833288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665735193 and 665735202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665735237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13431 + ... + 38882.

It is an arithmetic number, because the mean of its divisors is an integer number (34684182).

Almost surely, 2^665735238 is an apocalyptic number.

665735238 is an abundant number, since it is smaller than the sum of its proper divisors (999105498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665735238 is a wasteful number, since it uses less digits than its factorization.

665735238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52429 (or 52426 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 665735238 is about 25801.8456316598. The cubic root of 665735238 is about 873.1734361746.

The spelling of 665735238 in words is "six hundred sixty-five million, seven hundred thirty-five thousand, two hundred thirty-eight".