72400271 has 4 divisors (see below), whose sum is σ = 72420192. Its totient is φ = 72380352.

The previous prime is 72400259. The next prime is 72400357. The reversal of 72400271 is 17200427.

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 72400271 - 2²² = 68205967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72400871) 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, 2786 + ... + 12351.

It is an arithmetic number, because the mean of its divisors is an integer number (18105048).

Almost surely, 2^72400271 is an apocalyptic number.

72400271 is a deficient number, since it is larger than the sum of its proper divisors (19921).

72400271 is a wasteful number, since it uses less digits than its factorization.

72400271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 72400271 is about 8508.8348791124. The cubic root of 72400271 is about 416.7862637662.

Adding to 72400271 its reverse (17200427), we get a palindrome (89600698).

The spelling of 72400271 in words is "seventy-two million, four hundred thousand, two hundred seventy-one".