74407291729 has 3 divisors (see below), whose sum is σ = 74407564507. Its totient is φ = 74407018952.

The previous prime is 74407291703. The next prime is 74407291733. The reversal of 74407291729 is 92719270447.

The square root of 74407291729 is 272777.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92719270447 = 1453 ⋅63812299.

It can be written as a sum of positive squares in only one way, i.e., 2878859025 + 71528432704 = 53655^2 + 267448^2 .

It is not a de Polignac number, because 74407291729 - 2⁷ = 74407291601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74107291729) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 136389 + ... + 409165.

Almost surely, 2^74407291729 is an apocalyptic number.

74407291729 is the 272777-th square number.

74407291729 is the 136389-th centered octagonal number.

It is an amenable number.

74407291729 is a deficient number, since it is larger than the sum of its proper divisors (272778).

74407291729 is an frugal number, since it uses more digits than its factorization.

74407291729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545554 (or 272777 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 74407291729 in words is "seventy-four billion, four hundred seven million, two hundred ninety-one thousand, seven hundred twenty-nine".