73420729 has 2 divisors, whose sum is σ = 73420730. Its totient is φ = 73420728.

The previous prime is 73420727. The next prime is 73420751. The reversal of 73420729 is 92702437.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73359225 + 61504 = 8565^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 73420729 - 2¹ = 73420727 is a prime.

Together with 73420727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 73420694 and 73420703.

It is not a weakly prime, because it can be changed into another prime (73420727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36710364 + 36710365.

It is an arithmetic number, because the mean of its divisors is an integer number (36710365).

Almost surely, 2^73420729 is an apocalyptic number.

It is an amenable number.

73420729 is a deficient number, since it is larger than the sum of its proper divisors (1).

73420729 is an equidigital number, since it uses as much as digits as its factorization.

73420729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 73420729 is about 8568.5896739195. The cubic root of 73420729 is about 418.7352903721.

The spelling of 73420729 in words is "seventy-three million, four hundred twenty thousand, seven hundred twenty-nine".