72855742 has 4 divisors (see below), whose sum is σ = 109283616. Its totient is φ = 36427870.

The previous prime is 72855721. The next prime is 72855749. The reversal of 72855742 is 24755827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24755827 = 2131 ⋅11617.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 72855695 and 72855704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72855749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18213934 + ... + 18213937.

It is an arithmetic number, because the mean of its divisors is an integer number (27320904).

Almost surely, 2^72855742 is an apocalyptic number.

72855742 is a deficient number, since it is larger than the sum of its proper divisors (36427874).

72855742 is a wasteful number, since it uses less digits than its factorization.

72855742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36427873.

The product of its digits is 156800, while the sum is 40.

The square root of 72855742 is about 8535.5575096182. The cubic root of 72855742 is about 417.6584398710.

The spelling of 72855742 in words is "seventy-two million, eight hundred fifty-five thousand, seven hundred forty-two".