74771381 has 4 divisors (see below), whose sum is σ = 74810892. Its totient is φ = 74731872.

The previous prime is 74771371. The next prime is 74771387. The reversal of 74771381 is 18317747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18317747 = 7 ⋅2616821.

It can be written as a sum of positive squares in 2 ways, for example, as 46362481 + 28408900 = 6809^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 74771381 - 2⁶ = 74771317 is a prime.

It is a super-2 number, since 2×74771381² = 11181518833294322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74771387) 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, 16766 + ... + 20751.

It is an arithmetic number, because the mean of its divisors is an integer number (18702723).

Almost surely, 2^74771381 is an apocalyptic number.

It is an amenable number.

74771381 is a deficient number, since it is larger than the sum of its proper divisors (39511).

74771381 is a wasteful number, since it uses less digits than its factorization.

74771381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39510.

The product of its digits is 32928, while the sum is 38.

The square root of 74771381 is about 8647.0446396442. The cubic root of 74771381 is about 421.2873971149.

The spelling of 74771381 in words is "seventy-four million, seven hundred seventy-one thousand, three hundred eighty-one".