66238875 has 48 divisors (see below), whose sum is σ = 120836352. Its totient is φ = 34905600.

The previous prime is 66238867. The next prime is 66238889. The reversal of 66238875 is 57883266.

It is not a de Polignac number, because 66238875 - 2³ = 66238867 is a prime.

It is a super-2 number, since 2×66238875² = 8775177122531250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66238875.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108822 + ... + 109428.

It is an arithmetic number, because the mean of its divisors is an integer number (2517424).

Almost surely, 2^66238875 is an apocalyptic number.

66238875 is a deficient number, since it is larger than the sum of its proper divisors (54597477).

66238875 is a wasteful number, since it uses less digits than its factorization.

66238875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 712 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 66238875 is about 8138.7268660399. The cubic root of 66238875 is about 404.6109661573.

The spelling of 66238875 in words is "sixty-six million, two hundred thirty-eight thousand, eight hundred seventy-five".