72270073 has 4 divisors (see below), whose sum is σ = 73260148. Its totient is φ = 71280000.

The previous prime is 72270061. The next prime is 72270097. The reversal of 72270073 is 37007227.

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 18731584 + 53538489 = 4328^2 + 7317^2 .

It is a cyclic number.

It is not a de Polignac number, because 72270073 - 2²⁵ = 38715641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72270013) 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, 494928 + ... + 495073.

It is an arithmetic number, because the mean of its divisors is an integer number (18315037).

Almost surely, 2^72270073 is an apocalyptic number.

72270073 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

It is an amenable number.

72270073 is a deficient number, since it is larger than the sum of its proper divisors (990075).

72270073 is an equidigital number, since it uses as much as digits as its factorization.

72270073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990074.

The product of its (nonzero) digits is 4116, while the sum is 28.

The square root of 72270073 is about 8501.1806827052. The cubic root of 72270073 is about 416.5362771386.

The spelling of 72270073 in words is "seventy-two million, two hundred seventy thousand, seventy-three".