73568721 has 4 divisors (see below), whose sum is σ = 98091632. Its totient is φ = 49045812.

The previous prime is 73568713. The next prime is 73568723. The reversal of 73568721 is 12786537.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12786537 = 3 ⋅4262179.

It is not a de Polignac number, because 73568721 - 2³ = 73568713 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 73568721.

It is not an unprimeable number, because it can be changed into a prime (73568723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12261451 + ... + 12261456.

It is an arithmetic number, because the mean of its divisors is an integer number (24522908).

Almost surely, 2^73568721 is an apocalyptic number.

It is an amenable number.

73568721 is a deficient number, since it is larger than the sum of its proper divisors (24522911).

73568721 is a wasteful number, since it uses less digits than its factorization.

73568721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24522910.

The product of its digits is 70560, while the sum is 39.

The square root of 73568721 is about 8577.2210534648. The cubic root of 73568721 is about 419.0164456799.

The spelling of 73568721 in words is "seventy-three million, five hundred sixty-eight thousand, seven hundred twenty-one".