72817478 has 8 divisors (see below), whose sum is σ = 109352568. Its totient is φ = 36366624.

The previous prime is 72817457. The next prime is 72817489. The reversal of 72817478 is 87471827.

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

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 in 3 ways as a sum of consecutive naturals, for example, 18851 + ... + 22382.

It is an arithmetic number, because the mean of its divisors is an integer number (13669071).

Almost surely, 2^72817478 is an apocalyptic number.

72817478 is a deficient number, since it is larger than the sum of its proper divisors (36535090).

72817478 is a wasteful number, since it uses less digits than its factorization.

72817478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42118.

The product of its digits is 175616, while the sum is 44.

The square root of 72817478 is about 8533.3157682111. The cubic root of 72817478 is about 417.5853086817.

The spelling of 72817478 in words is "seventy-two million, eight hundred seventeen thousand, four hundred seventy-eight".