72200906 has 4 divisors (see below), whose sum is σ = 108301362. Its totient is φ = 36100452.

The previous prime is 72200899. The next prime is 72200911. The reversal of 72200906 is 60900227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60900227 = 107 ⋅569161.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 11282881 = 7805^2 + 3359^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18050225 + ... + 18050228.

Almost surely, 2^72200906 is an apocalyptic number.

72200906 is a deficient number, since it is larger than the sum of its proper divisors (36100456).

72200906 is a wasteful number, since it uses less digits than its factorization.

72200906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36100455.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 72200906 is about 8497.1116269000. Note that the first 3 decimals coincide. The cubic root of 72200906 is about 416.4033509284.

The spelling of 72200906 in words is "seventy-two million, two hundred thousand, nine hundred six".