72723251 has 4 divisors (see below), whose sum is σ = 72742392. Its totient is φ = 72704112.

The previous prime is 72723247. The next prime is 72723269. The reversal of 72723251 is 15232727.

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

It is a cyclic number.

It is not a de Polignac number, because 72723251 - 2² = 72723247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72723151) 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, 1730 + ... + 12183.

It is an arithmetic number, because the mean of its divisors is an integer number (18185598).

Almost surely, 2^72723251 is an apocalyptic number.

72723251 is a deficient number, since it is larger than the sum of its proper divisors (19141).

72723251 is a wasteful number, since it uses less digits than its factorization.

72723251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19140.

The product of its digits is 5880, while the sum is 29.

The square root of 72723251 is about 8527.7928563023. The cubic root of 72723251 is about 417.4051102074.

Adding to 72723251 its reverse (15232727), we get a palindrome (87955978).

The spelling of 72723251 in words is "seventy-two million, seven hundred twenty-three thousand, two hundred fifty-one".