72162305 has 4 divisors (see below), whose sum is σ = 86594772. Its totient is φ = 57729840.

The previous prime is 72162301. The next prime is 72162317. The reversal of 72162305 is 50326127.

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 54656449 + 17505856 = 7393^2 + 4184^2 .

It is not a de Polignac number, because 72162305 - 2² = 72162301 is a prime.

It is a super-3 number, since 3×72162305³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72162301) 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, 7216226 + ... + 7216235.

It is an arithmetic number, because the mean of its divisors is an integer number (21648693).

Almost surely, 2^72162305 is an apocalyptic number.

It is an amenable number.

72162305 is a deficient number, since it is larger than the sum of its proper divisors (14432467).

72162305 is a wasteful number, since it uses less digits than its factorization.

72162305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14432466.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 72162305 is about 8494.8399043184. The cubic root of 72162305 is about 416.3291300172.

The spelling of 72162305 in words is "seventy-two million, one hundred sixty-two thousand, three hundred five".