72551242 has 4 divisors (see below), whose sum is σ = 108826866. Its totient is φ = 36275620.

The previous prime is 72551233. The next prime is 72551251. The reversal of 72551242 is 24215527.

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

It is an interprime number because it is at equal distance from previous prime (72551233) and next prime (72551251).

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 22268961 = 7091^2 + 4719^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72551242.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18137809 + ... + 18137812.

Almost surely, 2^72551242 is an apocalyptic number.

72551242 is a deficient number, since it is larger than the sum of its proper divisors (36275624).

72551242 is a wasteful number, since it uses less digits than its factorization.

72551242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36275623.

The product of its digits is 5600, while the sum is 28.

The square root of 72551242 is about 8517.7016853139. The cubic root of 72551242 is about 417.0757606274.

Adding to 72551242 its reverse (24215527), we get a palindrome (96766769).

The spelling of 72551242 in words is "seventy-two million, five hundred fifty-one thousand, two hundred forty-two".