73720001 has 8 divisors (see below), whose sum is σ = 77020200. Its totient is φ = 70470400.

The previous prime is 73719983. The next prime is 73720013. The reversal of 73720001 is 10002737.

It can be written as a sum of positive squares in 4 ways, for example, as 20939776 + 52780225 = 4576^2 + 7265^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73720001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73720051) 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, 9656 + ... + 15513.

It is an arithmetic number, because the mean of its divisors is an integer number (9627525).

Almost surely, 2^73720001 is an apocalyptic number.

It is an amenable number.

73720001 is a deficient number, since it is larger than the sum of its proper divisors (3300199).

73720001 is a wasteful number, since it uses less digits than its factorization.

73720001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25299.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 73720001 is about 8586.0352317004. The cubic root of 73720001 is about 419.3034580933.

Adding to 73720001 its reverse (10002737), we get a palindrome (83722738).

The spelling of 73720001 in words is "seventy-three million, seven hundred twenty thousand, one".