72209894 has 4 divisors (see below), whose sum is σ = 108314844. Its totient is φ = 36104946.

The previous prime is 72209873. The next prime is 72209927. The reversal of 72209894 is 49890227.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18052472 + ... + 18052475.

It is an arithmetic number, because the mean of its divisors is an integer number (27078711).

Almost surely, 2^72209894 is an apocalyptic number.

72209894 is a deficient number, since it is larger than the sum of its proper divisors (36104950).

72209894 is a wasteful number, since it uses less digits than its factorization.

72209894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36104949.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 72209894 is about 8497.6404960436. The cubic root of 72209894 is about 416.4206290035.

The spelling of 72209894 in words is "seventy-two million, two hundred nine thousand, eight hundred ninety-four".