72288427 has 4 divisors (see below), whose sum is σ = 73004256. Its totient is φ = 71572600.

The previous prime is 72288421. The next prime is 72288439. The reversal of 72288427 is 72488227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72488227 = 7 ⋅10355461.

It is a cyclic number.

It is not a de Polignac number, because 72288427 - 2¹⁹ = 71764139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72288427.

It is not an unprimeable number, because it can be changed into a prime (72288421) 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, 357763 + ... + 357964.

It is an arithmetic number, because the mean of its divisors is an integer number (18251064).

Almost surely, 2^72288427 is an apocalyptic number.

72288427 is a deficient number, since it is larger than the sum of its proper divisors (715829).

72288427 is a wasteful number, since it uses less digits than its factorization.

72288427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715828.

The product of its digits is 100352, while the sum is 40.

The square root of 72288427 is about 8502.2601112881. The cubic root of 72288427 is about 416.5715358998.

The spelling of 72288427 in words is "seventy-two million, two hundred eighty-eight thousand, four hundred twenty-seven".