72239855 has 4 divisors (see below), whose sum is σ = 86687832. Its totient is φ = 57791880.

The previous prime is 72239837. The next prime is 72239857. The reversal of 72239855 is 55893227.

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

It is not a de Polignac number, because 72239855 - 2¹² = 72235759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72239857) 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, 7223981 + ... + 7223990.

It is an arithmetic number, because the mean of its divisors is an integer number (21671958).

Almost surely, 2^72239855 is an apocalyptic number.

72239855 is a deficient number, since it is larger than the sum of its proper divisors (14447977).

72239855 is a wasteful number, since it uses less digits than its factorization.

72239855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14447976.

The product of its digits is 151200, while the sum is 41.

The square root of 72239855 is about 8499.4032143439. The cubic root of 72239855 is about 416.4782141562.

The spelling of 72239855 in words is "seventy-two million, two hundred thirty-nine thousand, eight hundred fifty-five".