74839681 has 4 divisors (see below), whose sum is σ = 85531072. Its totient is φ = 64148292.

The previous prime is 74839679. The next prime is 74839711. The reversal of 74839681 is 18693847.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18693847 = 383 ⋅48809.

It is a cyclic number.

It is not a de Polignac number, because 74839681 - 2¹ = 74839679 is a prime.

It is a super-2 number, since 2×74839681² = 11201955704363522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74839481) 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, 5345685 + ... + 5345698.

It is an arithmetic number, because the mean of its divisors is an integer number (21382768).

Almost surely, 2^74839681 is an apocalyptic number.

It is an amenable number.

74839681 is a deficient number, since it is larger than the sum of its proper divisors (10691391).

74839681 is a wasteful number, since it uses less digits than its factorization.

74839681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10691390.

The product of its digits is 290304, while the sum is 46.

The square root of 74839681 is about 8650.9930643828. The cubic root of 74839681 is about 421.4156332220.

The spelling of 74839681 in words is "seventy-four million, eight hundred thirty-nine thousand, six hundred eighty-one".