72310345 has 8 divisors (see below), whose sum is σ = 87223176. Its totient is φ = 57547776.

The previous prime is 72310331. The next prime is 72310361. The reversal of 72310345 is 54301327.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 71031184 = 1131^2 + 8428^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72310345 - 2¹⁷ = 72179273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36502 + ... + 38431.

It is an arithmetic number, because the mean of its divisors is an integer number (10902897).

Almost surely, 2^72310345 is an apocalyptic number.

It is an amenable number.

72310345 is a deficient number, since it is larger than the sum of its proper divisors (14912831).

72310345 is a wasteful number, since it uses less digits than its factorization.

72310345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75131.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 72310345 is about 8503.5489649910. The cubic root of 72310345 is about 416.6136334280.

The spelling of 72310345 in words is "seventy-two million, three hundred ten thousand, three hundred forty-five".