74686613 has 2 divisors, whose sum is σ = 74686614. Its totient is φ = 74686612.

The previous prime is 74686607. The next prime is 74686621. The reversal of 74686613 is 31668647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64995844 + 9690769 = 8062^2 + 3113^2 .

It is a cyclic number.

It is not a de Polignac number, because 74686613 - 2⁴ = 74686597 is a prime.

It is a super-2 number, since 2×74686613² = 11156180322823538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74686603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37343306 + 37343307.

It is an arithmetic number, because the mean of its divisors is an integer number (37343307).

Almost surely, 2^74686613 is an apocalyptic number.

It is an amenable number.

74686613 is a deficient number, since it is larger than the sum of its proper divisors (1).

74686613 is an equidigital number, since it uses as much as digits as its factorization.

74686613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 74686613 is about 8642.1416905765. The cubic root of 74686613 is about 421.1281329976.

The spelling of 74686613 in words is "seventy-four million, six hundred eighty-six thousand, six hundred thirteen".