72517894 has 4 divisors (see below), whose sum is σ = 108776844. Its totient is φ = 36258946.

The previous prime is 72517883. The next prime is 72517931. The reversal of 72517894 is 49871527.

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 72517894.

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, 18129472 + ... + 18129475.

It is an arithmetic number, because the mean of its divisors is an integer number (27194211).

Almost surely, 2^72517894 is an apocalyptic number.

72517894 is a deficient number, since it is larger than the sum of its proper divisors (36258950).

72517894 is a wasteful number, since it uses less digits than its factorization.

72517894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36258949.

The product of its digits is 141120, while the sum is 43.

The square root of 72517894 is about 8515.7438899958. The cubic root of 72517894 is about 417.0118482181.

The spelling of 72517894 in words is "seventy-two million, five hundred seventeen thousand, eight hundred ninety-four".