72015181 has 16 divisors (see below), whose sum is σ = 84240000. Its totient is φ = 60285888.

The previous prime is 72015169. The next prime is 72015191. The reversal of 72015181 is 18151027.

It is a cyclic number.

It is not a de Polignac number, because 72015181 - 2¹¹ = 72013133 is a prime.

It is a super-2 number, since 2×72015181² = 10372372588925522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72015131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144070 + ... + 144568.

It is an arithmetic number, because the mean of its divisors is an integer number (5265000).

Almost surely, 2^72015181 is an apocalyptic number.

It is an amenable number.

72015181 is a deficient number, since it is larger than the sum of its proper divisors (12224819).

72015181 is a wasteful number, since it uses less digits than its factorization.

72015181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 72015181 is about 8486.1758760940. The cubic root of 72015181 is about 416.0460012154.

The spelling of 72015181 in words is "seventy-two million, fifteen thousand, one hundred eighty-one".