73627721 has 4 divisors (see below), whose sum is σ = 73901700. Its totient is φ = 73353744.

The previous prime is 73627703. The next prime is 73627777. The reversal of 73627721 is 12772637.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41422096 + 32205625 = 6436^2 + 5675^2 .

It is a cyclic number.

It is not a de Polignac number, because 73627721 - 2¹⁰ = 73626697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73620721) 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, 136586 + ... + 137123.

It is an arithmetic number, because the mean of its divisors is an integer number (18475425).

Almost surely, 2^73627721 is an apocalyptic number.

It is an amenable number.

73627721 is a deficient number, since it is larger than the sum of its proper divisors (273979).

73627721 is a wasteful number, since it uses less digits than its factorization.

73627721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273978.

The product of its digits is 24696, while the sum is 35.

The square root of 73627721 is about 8580.6597065727. The cubic root of 73627721 is about 419.1284287987.

The spelling of 73627721 in words is "seventy-three million, six hundred twenty-seven thousand, seven hundred twenty-one".