72081242 has 4 divisors (see below), whose sum is σ = 108121866. Its totient is φ = 36040620.

The previous prime is 72081203. The next prime is 72081253. The reversal of 72081242 is 24218027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24218027 = 19 ⋅1274633.

It can be written as a sum of positive squares in only one way, i.e., 54449641 + 17631601 = 7379^2 + 4199^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18020309 + ... + 18020312.

Almost surely, 2^72081242 is an apocalyptic number.

72081242 is a deficient number, since it is larger than the sum of its proper divisors (36040624).

72081242 is a wasteful number, since it uses less digits than its factorization.

72081242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36040623.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 72081242 is about 8490.0672553284. The cubic root of 72081242 is about 416.1731781744.

Adding to 72081242 its reverse (24218027), we get a palindrome (96299269).

The spelling of 72081242 in words is "seventy-two million, eighty-one thousand, two hundred forty-two".