72011305 has 8 divisors (see below), whose sum is σ = 86688072. Its totient is φ = 57426048.

The previous prime is 72011257. The next prime is 72011327. The reversal of 72011305 is 50311027.

It can be written as a sum of positive squares in 4 ways, for example, as 11108889 + 60902416 = 3333^2 + 7804^2 .

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 72011305 - 2¹⁵ = 71978537 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, 21132 + ... + 24301.

It is an arithmetic number, because the mean of its divisors is an integer number (10836009).

Almost surely, 2^72011305 is an apocalyptic number.

It is an amenable number.

72011305 is a deficient number, since it is larger than the sum of its proper divisors (14676767).

72011305 is a wasteful number, since it uses less digits than its factorization.

72011305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45755.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 72011305 is about 8485.9475016052. The cubic root of 72011305 is about 416.0385369409.

The spelling of 72011305 in words is "seventy-two million, eleven thousand, three hundred five".