72455993 has 4 divisors (see below), whose sum is σ = 73203060. Its totient is φ = 71708928.

The previous prime is 72455909. The next prime is 72456001. The reversal of 72455993 is 39955427.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32171584 + 40284409 = 5672^2 + 6347^2 .

It is a cyclic number.

It is not a de Polignac number, because 72455993 - 2⁸ = 72455737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72455093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373388 + ... + 373581.

It is an arithmetic number, because the mean of its divisors is an integer number (18300765).

Almost surely, 2^72455993 is an apocalyptic number.

It is an amenable number.

72455993 is a deficient number, since it is larger than the sum of its proper divisors (747067).

72455993 is an equidigital number, since it uses as much as digits as its factorization.

72455993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747066.

The product of its digits is 340200, while the sum is 44.

The square root of 72455993 is about 8512.1086106793. The cubic root of 72455993 is about 416.8931611960.

The spelling of 72455993 in words is "seventy-two million, four hundred fifty-five thousand, nine hundred ninety-three".