66893769 has 32 divisors (see below), whose sum is σ = 101942400. Its totient is φ = 43879968.

The previous prime is 66893747. The next prime is 66893773. The reversal of 66893769 is 96739866.

It is a happy number.

It is not a de Polignac number, because 66893769 - 2⁸ = 66893513 is a prime.

It is a super-2 number, since 2×66893769² = 8949552662050722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66893789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159442 + ... + 159860.

It is an arithmetic number, because the mean of its divisors is an integer number (3185700).

Almost surely, 2^66893769 is an apocalyptic number.

It is an amenable number.

66893769 is a deficient number, since it is larger than the sum of its proper divisors (35048631).

66893769 is an frugal number, since it uses more digits than its factorization.

66893769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 495 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 66893769 is about 8178.8611065356. The cubic root of 66893769 is about 405.9400386264.

The spelling of 66893769 in words is "sixty-six million, eight hundred ninety-three thousand, seven hundred sixty-nine".