72081291 has 8 divisors (see below), whose sum is σ = 98706064. Its totient is φ = 46755360.

The previous prime is 72081281. The next prime is 72081301. The reversal of 72081291 is 19218027.

It is an interprime number because it is at equal distance from previous prime (72081281) and next prime (72081301).

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

It is not a de Polignac number, because 72081291 - 2¹¹ = 72079243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72081271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324580 + ... + 324801.

It is an arithmetic number, because the mean of its divisors is an integer number (12338258).

Almost surely, 2^72081291 is an apocalyptic number.

72081291 is a deficient number, since it is larger than the sum of its proper divisors (26624773).

72081291 is a wasteful number, since it uses less digits than its factorization.

72081291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649421.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 72081291 is about 8490.0701410530. The cubic root of 72081291 is about 416.1732724776.

The spelling of 72081291 in words is "seventy-two million, eighty-one thousand, two hundred ninety-one".