73755721 has 8 divisors (see below), whose sum is σ = 79538760. Its totient is φ = 67988352.

The previous prime is 73755719. The next prime is 73755767. The reversal of 73755721 is 12755737.

It can be written as a sum of positive squares in 4 ways, for example, as 23629321 + 50126400 = 4861^2 + 7080^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73755721 - 2¹ = 73755719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73755791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7011 + ... + 14023.

It is an arithmetic number, because the mean of its divisors is an integer number (9942345).

Almost surely, 2^73755721 is an apocalyptic number.

It is an amenable number.

73755721 is a deficient number, since it is larger than the sum of its proper divisors (5783039).

73755721 is a wasteful number, since it uses less digits than its factorization.

73755721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7835.

The product of its digits is 51450, while the sum is 37.

The square root of 73755721 is about 8588.1151016972. The cubic root of 73755721 is about 419.3711697089.

The spelling of 73755721 in words is "seventy-three million, seven hundred fifty-five thousand, seven hundred twenty-one".