74691613 has 4 divisors (see below), whose sum is σ = 74724700. Its totient is φ = 74658528.

The previous prime is 74691611. The next prime is 74691619. The reversal of 74691613 is 31619647.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33385284 + 41306329 = 5778^2 + 6427^2 .

It is a cyclic number.

It is not a de Polignac number, because 74691613 - 2¹ = 74691611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74691611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12888 + ... + 17761.

It is an arithmetic number, because the mean of its divisors is an integer number (18681175).

Almost surely, 2^74691613 is an apocalyptic number.

It is an amenable number.

74691613 is a deficient number, since it is larger than the sum of its proper divisors (33087).

74691613 is a wasteful number, since it uses less digits than its factorization.

74691613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33086.

The product of its digits is 27216, while the sum is 37.

The square root of 74691613 is about 8642.4309658799. The cubic root of 74691613 is about 421.1375304590.

The spelling of 74691613 in words is "seventy-four million, six hundred ninety-one thousand, six hundred thirteen".