74033512281 has 9 divisors (see below), whose sum is σ = 106938474591. Its totient is φ = 49355130672.

The previous prime is 74033512253. The next prime is 74033512433. The reversal of 74033512281 is 18221533047.

The square root of 74033512281 is 272091.

It is a perfect power (a square), and thus also a powerful number.

74033512281 is a `hidden beast` number, since 7 + 40 + 335 + 1 + 2 + 281 = 666.

It can be written as a sum of positive squares in only one way, i.e., 69862419225 + 4171093056 = 264315^2 + 64584^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-74033512281 is a prime.

It is a super-2 number, since 2×74033512281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74033512981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 770925 + ... + 861621.

Almost surely, 2^74033512281 is an apocalyptic number.

74033512281 is the 272091-st square number.

74033512281 is the 136046-th centered octagonal number.

It is an amenable number.

74033512281 is a deficient number, since it is larger than the sum of its proper divisors (32904962310).

74033512281 is an frugal number, since it uses more digits than its factorization.

74033512281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181400 (or 90700 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

Multiplying 74033512281 by its sum of digits (36), we get a square (2665206442116 = 1632546²).

The spelling of 74033512281 in words is "seventy-four billion, thirty-three million, five hundred twelve thousand, two hundred eighty-one".