73727521 has 16 divisors (see below), whose sum is σ = 90737280. Its totient is φ = 58464000.

The previous prime is 73727501. The next prime is 73727539. The reversal of 73727521 is 12572737.

It is a happy number.

It is not a de Polignac number, because 73727521 - 2⁹ = 73727009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73727501) 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 in 15 ways as a sum of consecutive naturals, for example, 1771 + ... + 12271.

It is an arithmetic number, because the mean of its divisors is an integer number (5671080).

Almost surely, 2^73727521 is an apocalyptic number.

It is an amenable number.

73727521 is a deficient number, since it is larger than the sum of its proper divisors (17009759).

73727521 is a wasteful number, since it uses less digits than its factorization.

73727521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10584.

The product of its digits is 20580, while the sum is 34.

The square root of 73727521 is about 8586.4731409351. The cubic root of 73727521 is about 419.3177149876.

The spelling of 73727521 in words is "seventy-three million, seven hundred twenty-seven thousand, five hundred twenty-one".