66887538 has 16 divisors (see below), whose sum is σ = 135660096. Its totient is φ = 21981680.

The previous prime is 66887531. The next prime is 66887551. The reversal of 66887538 is 83578866.

It is a super-3 number, since 3×66887538³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66887531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78081 + ... + 78932.

It is an arithmetic number, because the mean of its divisors is an integer number (8478756).

Almost surely, 2^66887538 is an apocalyptic number.

66887538 is an abundant number, since it is smaller than the sum of its proper divisors (68772558).

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

66887538 is a wasteful number, since it uses less digits than its factorization.

66887538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157089.

The product of its digits is 1935360, while the sum is 51.

The square root of 66887538 is about 8178.4801766587. The cubic root of 66887538 is about 405.9274341095.

The spelling of 66887538 in words is "sixty-six million, eight hundred eighty-seven thousand, five hundred thirty-eight".