72216001 has 16 divisors (see below), whose sum is σ = 85236480. Its totient is φ = 60318720.

The previous prime is 72215999. The next prime is 72216013. The reversal of 72216001 is 10061227.

It is not a de Polignac number, because 72216001 - 2¹ = 72215999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72216001.

It is not an unprimeable number, because it can be changed into a prime (72216031) 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, 33121 + ... + 35233.

It is an arithmetic number, because the mean of its divisors is an integer number (5327280).

Almost surely, 2^72216001 is an apocalyptic number.

It is an amenable number.

72216001 is a deficient number, since it is larger than the sum of its proper divisors (13020479).

72216001 is a wasteful number, since it uses less digits than its factorization.

72216001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 72216001 is about 8497.9998234879. Note that the first 3 decimals coincide. The cubic root of 72216001 is about 416.4323679724.

Adding to 72216001 its reverse (10061227), we get a palindrome (82277228).

The spelling of 72216001 in words is "seventy-two million, two hundred sixteen thousand, one".