72217801 has 4 divisors (see below), whose sum is σ = 74708100. Its totient is φ = 69727504.

The previous prime is 72217793. The next prime is 72217813. The reversal of 72217801 is 10871227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16192576 + 56025225 = 4024^2 + 7485^2 .

It is a cyclic number.

It is not a de Polignac number, because 72217801 - 2³ = 72217793 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 72217801.

It is not an unprimeable number, because it can be changed into a prime (72217001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1245106 + ... + 1245163.

It is an arithmetic number, because the mean of its divisors is an integer number (18677025).

Almost surely, 2^72217801 is an apocalyptic number.

It is an amenable number.

72217801 is a deficient number, since it is larger than the sum of its proper divisors (2490299).

72217801 is a wasteful number, since it uses less digits than its factorization.

72217801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490298.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 72217801 is about 8498.1057301024. The cubic root of 72217801 is about 416.4358278336.

The spelling of 72217801 in words is "seventy-two million, two hundred seventeen thousand, eight hundred one".