72294778 has 8 divisors (see below), whose sum is σ = 114821172. Its totient is φ = 34021056.

The previous prime is 72294757. The next prime is 72294787. The reversal of 72294778 is 87749227.

It can be written as a sum of positive squares in 2 ways, for example, as 69172489 + 3122289 = 8317^2 + 1767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 1063125 + ... + 1063192.

Almost surely, 2^72294778 is an apocalyptic number.

72294778 is a deficient number, since it is larger than the sum of its proper divisors (42526394).

72294778 is a wasteful number, since it uses less digits than its factorization.

72294778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126336.

The product of its digits is 395136, while the sum is 46.

The square root of 72294778 is about 8502.6335920114. The cubic root of 72294778 is about 416.5837350325.

The spelling of 72294778 in words is "seventy-two million, two hundred ninety-four thousand, seven hundred seventy-eight".