72235771 has 4 divisors (see below), whose sum is σ = 76484952. Its totient is φ = 67986592.

The previous prime is 72235769. The next prime is 72235789. The reversal of 72235771 is 17753227.

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 72235771 - 2¹ = 72235769 is a prime.

It is a super-2 number, since 2×72235771² = 10436013223928882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72235711) 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, 2124565 + ... + 2124598.

It is an arithmetic number, because the mean of its divisors is an integer number (19121238).

Almost surely, 2^72235771 is an apocalyptic number.

72235771 is a deficient number, since it is larger than the sum of its proper divisors (4249181).

72235771 is a wasteful number, since it uses less digits than its factorization.

72235771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249180.

The product of its digits is 20580, while the sum is 34.

The square root of 72235771 is about 8499.1629587860. The cubic root of 72235771 is about 416.4703656305.

Adding to 72235771 its reverse (17753227), we get a palindrome (89988998).

The spelling of 72235771 in words is "seventy-two million, two hundred thirty-five thousand, seven hundred seventy-one".