74428729 has 2 divisors, whose sum is σ = 74428730. Its totient is φ = 74428728.

The previous prime is 74428687. The next prime is 74428733. The reversal of 74428729 is 92782447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74425129 + 3600 = 8627^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 74428729 - 2⁹ = 74428217 is a prime.

It is not a weakly prime, because it can be changed into another prime (74428769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37214364 + 37214365.

It is an arithmetic number, because the mean of its divisors is an integer number (37214365).

Almost surely, 2^74428729 is an apocalyptic number.

It is an amenable number.

74428729 is a deficient number, since it is larger than the sum of its proper divisors (1).

74428729 is an equidigital number, since it uses as much as digits as its factorization.

74428729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 43.

The square root of 74428729 is about 8627.2086447472. The cubic root of 74428729 is about 420.6428722516.

It can be divided in two parts, 74428 and 729, that added together give a palindrome (75157).

The spelling of 74428729 in words is "seventy-four million, four hundred twenty-eight thousand, seven hundred twenty-nine".