72427555 has 4 divisors (see below), whose sum is σ = 86913072. Its totient is φ = 57942040.

The previous prime is 72427547. The next prime is 72427561. The reversal of 72427555 is 55572427.

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

It is not a de Polignac number, because 72427555 - 2³ = 72427547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7242751 + ... + 7242760.

It is an arithmetic number, because the mean of its divisors is an integer number (21728268).

Almost surely, 2^72427555 is an apocalyptic number.

72427555 is a deficient number, since it is larger than the sum of its proper divisors (14485517).

72427555 is a wasteful number, since it uses less digits than its factorization.

72427555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14485516.

The product of its digits is 98000, while the sum is 37.

The square root of 72427555 is about 8510.4380028292. The cubic root of 72427555 is about 416.8386124112.

The spelling of 72427555 in words is "seventy-two million, four hundred twenty-seven thousand, five hundred fifty-five".