73067721 has 16 divisors (see below), whose sum is σ = 99783744. Its totient is φ = 47545344.

The previous prime is 73067693. The next prime is 73067723. The reversal of 73067721 is 12776037.

It is not a de Polignac number, because 73067721 - 2⁵ = 73067689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73067723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21105 + ... + 24321.

It is an arithmetic number, because the mean of its divisors is an integer number (6236484).

Almost surely, 2^73067721 is an apocalyptic number.

It is an amenable number.

73067721 is a deficient number, since it is larger than the sum of its proper divisors (26716023).

73067721 is a wasteful number, since it uses less digits than its factorization.

73067721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400.

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 73067721 is about 8547.9658983878. The cubic root of 73067721 is about 418.0631166948.

The spelling of 73067721 in words is "seventy-three million, sixty-seven thousand, seven hundred twenty-one".