73579721 has 2 divisors, whose sum is σ = 73579722. Its totient is φ = 73579720.

The previous prime is 73579679. The next prime is 73579811. The reversal of 73579721 is 12797537.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 11485321 = 7880^2 + 3389^2 .

It is a cyclic number.

It is not a de Polignac number, because 73579721 - 2⁶ = 73579657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (73579021) 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, 36789860 + 36789861.

It is an arithmetic number, because the mean of its divisors is an integer number (36789861).

Almost surely, 2^73579721 is an apocalyptic number.

It is an amenable number.

73579721 is a deficient number, since it is larger than the sum of its proper divisors (1).

73579721 is an equidigital number, since it uses as much as digits as its factorization.

73579721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92610, while the sum is 41.

The square root of 73579721 is about 8577.8622628252. The cubic root of 73579721 is about 419.0373284280.

The spelling of 73579721 in words is "seventy-three million, five hundred seventy-nine thousand, seven hundred twenty-one".