72345001 has 4 divisors (see below), whose sum is σ = 72508752. Its totient is φ = 72181252.

The previous prime is 72344999. The next prime is 72345011. The reversal of 72345001 is 10054327.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10054327 = 17 ⋅591431.

It is a cyclic number.

It is not a de Polignac number, because 72345001 - 2¹ = 72344999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72345011) 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, 81211 + ... + 82096.

It is an arithmetic number, because the mean of its divisors is an integer number (18127188).

Almost surely, 2^72345001 is an apocalyptic number.

It is an amenable number.

72345001 is a deficient number, since it is larger than the sum of its proper divisors (163751).

72345001 is a wasteful number, since it uses less digits than its factorization.

72345001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163750.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 72345001 is about 8505.5864583226. The cubic root of 72345001 is about 416.6801792596.

Adding to 72345001 its reverse (10054327), we get a palindrome (82399328).

The spelling of 72345001 in words is "seventy-two million, three hundred forty-five thousand, one".