67661869 has 18 divisors (see below), whose sum is σ = 78543150. Its totient is φ = 58235760.

The previous prime is 67661861. The next prime is 67661897. The reversal of 67661869 is 96816676.

It can be written as a sum of positive squares in only one way, i.e., 53509225 + 14152644 = 7315^2 + 3762^2 .

It is not a de Polignac number, because 67661869 - 2³ = 67661861 is a prime.

It is a super-2 number, since 2×67661869² = 9156257033146322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67661861) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 42907 + ... + 44455.

Almost surely, 2^67661869 is an apocalyptic number.

It is an amenable number.

67661869 is a deficient number, since it is larger than the sum of its proper divisors (10881281).

67661869 is a wasteful number, since it uses less digits than its factorization.

67661869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1579 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 67661869 is about 8225.6834974366. The cubic root of 67661869 is about 407.4878493874.

The spelling of 67661869 in words is "sixty-seven million, six hundred sixty-one thousand, eight hundred sixty-nine".