72006391 has 8 divisors (see below), whose sum is σ = 74951280. Its totient is φ = 69092352.

The previous prime is 72006349. The next prime is 72006419. The reversal of 72006391 is 19360027.

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 72006391 - 2¹¹ = 72004343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72006091) 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, 2890 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (9368910).

Almost surely, 2^72006391 is an apocalyptic number.

72006391 is a deficient number, since it is larger than the sum of its proper divisors (2944889).

72006391 is a wasteful number, since it uses less digits than its factorization.

72006391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15425.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 72006391 is about 8485.6579591685. The cubic root of 72006391 is about 416.0290733348.

The spelling of 72006391 in words is "seventy-two million, six thousand, three hundred ninety-one".