72305278 has 8 divisors (see below), whose sum is σ = 108503640. Its totient is φ = 36137400.

The previous prime is 72305249. The next prime is 72305281. The reversal of 72305278 is 87250327.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273 + ... + 12028.

It is an arithmetic number, because the mean of its divisors is an integer number (13562955).

Almost surely, 2^72305278 is an apocalyptic number.

72305278 is a deficient number, since it is larger than the sum of its proper divisors (36198362).

72305278 is a wasteful number, since it uses less digits than its factorization.

72305278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15242.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 72305278 is about 8503.2510253432. The cubic root of 72305278 is about 416.6039020837.

The spelling of 72305278 in words is "seventy-two million, three hundred five thousand, two hundred seventy-eight".