72197807 has 4 divisors (see below), whose sum is σ = 78761256. Its totient is φ = 65634360.

The previous prime is 72197789. The next prime is 72197813. The reversal of 72197807 is 70879127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70879127 = 11 ⋅6443557.

It is not a de Polignac number, because 72197807 - 2⁸ = 72197551 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 (72197857) 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, 3281708 + ... + 3281729.

It is an arithmetic number, because the mean of its divisors is an integer number (19690314).

Almost surely, 2^72197807 is an apocalyptic number.

72197807 is a deficient number, since it is larger than the sum of its proper divisors (6563449).

72197807 is a wasteful number, since it uses less digits than its factorization.

72197807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6563448.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 72197807 is about 8496.9292688594. The cubic root of 72197807 is about 416.3973932356.

The spelling of 72197807 in words is "seventy-two million, one hundred ninety-seven thousand, eight hundred seven".