72247894 has 4 divisors (see below), whose sum is σ = 108371844. Its totient is φ = 36123946.

The previous prime is 72247871. The next prime is 72247907. The reversal of 72247894 is 49874227.

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

It is a self number, because there is not a number n which added to its sum of digits gives 72247894.

It is a congruent number.

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, 18061972 + ... + 18061975.

It is an arithmetic number, because the mean of its divisors is an integer number (27092961).

Almost surely, 2^72247894 is an apocalyptic number.

72247894 is a deficient number, since it is larger than the sum of its proper divisors (36123950).

72247894 is a wasteful number, since it uses less digits than its factorization.

72247894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36123949.

The product of its digits is 225792, while the sum is 43.

The square root of 72247894 is about 8499.8761167443. The cubic root of 72247894 is about 416.4936624346.

The spelling of 72247894 in words is "seventy-two million, two hundred forty-seven thousand, eight hundred ninety-four".