72157727 has 4 divisors (see below), whose sum is σ = 73234776. Its totient is φ = 71080680.

The previous prime is 72157721. The next prime is 72157747. The reversal of 72157727 is 72775127.

It is a happy number.

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 72157727 - 2⁴ = 72157711 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 (72157721) 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, 538424 + ... + 538557.

It is an arithmetic number, because the mean of its divisors is an integer number (18308694).

Almost surely, 2^72157727 is an apocalyptic number.

72157727 is a deficient number, since it is larger than the sum of its proper divisors (1077049).

72157727 is a wasteful number, since it uses less digits than its factorization.

72157727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077048.

The product of its digits is 48020, while the sum is 38.

The square root of 72157727 is about 8494.5704423473. The cubic root of 72157727 is about 416.3203258128.

The spelling of 72157727 in words is "seventy-two million, one hundred fifty-seven thousand, seven hundred twenty-seven".