74861687 has 2 divisors, whose sum is σ = 74861688. Its totient is φ = 74861686.

The previous prime is 74861681. The next prime is 74861747. The reversal of 74861687 is 78616847.

It is a weak prime.

It is an emirp because it is prime and its reverse (78616847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74861687 - 2⁸ = 74861431 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74861681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37430843 + 37430844.

It is an arithmetic number, because the mean of its divisors is an integer number (37430844).

Almost surely, 2^74861687 is an apocalyptic number.

74861687 is a deficient number, since it is larger than the sum of its proper divisors (1).

74861687 is an equidigital number, since it uses as much as digits as its factorization.

74861687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 74861687 is about 8652.2648480037. The cubic root of 74861687 is about 421.4569337883.

The spelling of 74861687 in words is "seventy-four million, eight hundred sixty-one thousand, six hundred eighty-seven".