74153781 has 12 divisors (see below), whose sum is σ = 115350508. Its totient is φ = 45633024.

The previous prime is 74153773. The next prime is 74153797. The reversal of 74153781 is 18735147.

74153781 is a `hidden beast` number, since 7 + 41 + 537 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22184100 + 51969681 = 4710^2 + 7209^2 .

It is not a de Polignac number, because 74153781 - 2³ = 74153773 is a prime.

It is a super-2 number, since 2×74153781² = 10997566473191922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74153281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316780 + ... + 317013.

Almost surely, 2^74153781 is an apocalyptic number.

It is an amenable number.

74153781 is a deficient number, since it is larger than the sum of its proper divisors (41196727).

74153781 is a wasteful number, since it uses less digits than its factorization.

74153781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633812 (or 633809 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 74153781 is about 8611.2589671894. The cubic root of 74153781 is about 420.1242659507.

The spelling of 74153781 in words is "seventy-four million, one hundred fifty-three thousand, seven hundred eighty-one".