74985689 has 2 divisors, whose sum is σ = 74985690. Its totient is φ = 74985688.

The previous prime is 74985649. The next prime is 74985709. The reversal of 74985689 is 98658947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57638464 + 17347225 = 7592^2 + 4165^2 .

It is an emirp because it is prime and its reverse (98658947) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74985689 is a prime.

It is not a weakly prime, because it can be changed into another prime (74985629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37492844 + 37492845.

It is an arithmetic number, because the mean of its divisors is an integer number (37492845).

Almost surely, 2^74985689 is an apocalyptic number.

It is an amenable number.

74985689 is a deficient number, since it is larger than the sum of its proper divisors (1).

74985689 is an equidigital number, since it uses as much as digits as its factorization.

74985689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The square root of 74985689 is about 8659.4277524557. The cubic root of 74985689 is about 421.6895079116.

The spelling of 74985689 in words is "seventy-four million, nine hundred eighty-five thousand, six hundred eighty-nine".