72991294 has 4 divisors (see below), whose sum is σ = 109486944. Its totient is φ = 36495646.

The previous prime is 72991291. The next prime is 72991297. The reversal of 72991294 is 49219927.

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

It is an interprime number because it is at equal distance from previous prime (72991291) and next prime (72991297).

It is a self number, because there is not a number n which added to its sum of digits gives 72991294.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72991291) by changing a digit.

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, 18247822 + ... + 18247825.

It is an arithmetic number, because the mean of its divisors is an integer number (27371736).

Almost surely, 2^72991294 is an apocalyptic number.

72991294 is a deficient number, since it is larger than the sum of its proper divisors (36495650).

72991294 is a wasteful number, since it uses less digits than its factorization.

72991294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36495649.

The product of its digits is 81648, while the sum is 43.

The square root of 72991294 is about 8543.4942500127. The cubic root of 72991294 is about 417.9173046730.

The spelling of 72991294 in words is "seventy-two million, nine hundred ninety-one thousand, two hundred ninety-four".