66435238 has 4 divisors (see below), whose sum is σ = 99652860. Its totient is φ = 33217618.

The previous prime is 66435233. The next prime is 66435241. The reversal of 66435238 is 83253466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83253466 = 2 ⋅41626733.

It is a junction number, because it is equal to n+sod(n) for n = 66435197 and 66435206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66435233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16608808 + ... + 16608811.

It is an arithmetic number, because the mean of its divisors is an integer number (24913215).

Almost surely, 2^66435238 is an apocalyptic number.

66435238 is a deficient number, since it is larger than the sum of its proper divisors (33217622).

66435238 is a wasteful number, since it uses less digits than its factorization.

66435238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33217621.

The product of its digits is 103680, while the sum is 37.

The square root of 66435238 is about 8150.7814349300. The cubic root of 66435238 is about 405.0103904259.

It can be divided in two parts, 6643 and 5238, that added together give a square (11881 = 109²).

The spelling of 66435238 in words is "sixty-six million, four hundred thirty-five thousand, two hundred thirty-eight".