72197811 has 40 divisors (see below), whose sum is σ = 124027904. Its totient is φ = 40998960.

The previous prime is 72197789. The next prime is 72197813. The reversal of 72197811 is 11879127.

It is not a de Polignac number, because 72197811 - 2⁷ = 72197683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72197813) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 126156 + ... + 126726.

Almost surely, 2^72197811 is an apocalyptic number.

72197811 is a deficient number, since it is larger than the sum of its proper divisors (51830093).

72197811 is a wasteful number, since it uses less digits than its factorization.

72197811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813 (or 804 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 72197811 is about 8496.9295042386. The cubic root of 72197811 is about 416.3974009256.

The spelling of 72197811 in words is "seventy-two million, one hundred ninety-seven thousand, eight hundred eleven".