73576721 has 4 divisors (see below), whose sum is σ = 77449200. Its totient is φ = 69704244.

The previous prime is 73576709. The next prime is 73576739. The reversal of 73576721 is 12767537.

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.

It is a cyclic number.

It is not a de Polignac number, because 73576721 - 2¹⁴ = 73560337 is a prime.

It is a super-2 number, since 2×73576721² = 10827067746223682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73576421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1936211 + ... + 1936248.

It is an arithmetic number, because the mean of its divisors is an integer number (19362300).

Almost surely, 2^73576721 is an apocalyptic number.

It is an amenable number.

73576721 is a deficient number, since it is larger than the sum of its proper divisors (3872479).

73576721 is a wasteful number, since it uses less digits than its factorization.

73576721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872478.

The product of its digits is 61740, while the sum is 38.

The square root of 73576721 is about 8577.6873922987. The cubic root of 73576721 is about 419.0316333395.

The spelling of 73576721 in words is "seventy-three million, five hundred seventy-six thousand, seven hundred twenty-one".