66887469 has 36 divisors (see below), whose sum is σ = 112474908. Its totient is φ = 38142720.

The previous prime is 66887461. The next prime is 66887477. The reversal of 66887469 is 96478866.

It is an interprime number because it is at equal distance from previous prime (66887461) and next prime (66887477).

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 48483369 = 4290^2 + 6963^2 .

It is not a de Polignac number, because 66887469 - 2³ = 66887461 is a prime.

It is a super-2 number, since 2×66887469² = 8947867018451922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66887461) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16707 + ... + 20319.

It is an arithmetic number, because the mean of its divisors is an integer number (3124303).

Almost surely, 2^66887469 is an apocalyptic number.

It is an amenable number.

66887469 is a deficient number, since it is larger than the sum of its proper divisors (45587439).

66887469 is a wasteful number, since it uses less digits than its factorization.

66887469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658 (or 3644 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 66887469 is about 8178.4759582700. The cubic root of 66887469 is about 405.9272945269.

The spelling of 66887469 in words is "sixty-six million, eight hundred eighty-seven thousand, four hundred sixty-nine".