72918707815 has 8 divisors (see below), whose sum is σ = 87503915088. Its totient is φ = 58333989120.

The previous prime is 72918707773. The next prime is 72918707821. The reversal of 72918707815 is 51870781927.

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

It is not a de Polignac number, because 72918707815 - 2¹¹ = 72918705767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448984 + ... + 589426.

It is an arithmetic number, because the mean of its divisors is an integer number (10937989386).

Almost surely, 2^72918707815 is an apocalyptic number.

72918707815 is a deficient number, since it is larger than the sum of its proper divisors (14585207273).

72918707815 is a wasteful number, since it uses less digits than its factorization.

72918707815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244289.

The product of its (nonzero) digits is 1975680, while the sum is 55.

The spelling of 72918707815 in words is "seventy-two billion, nine hundred eighteen million, seven hundred seven thousand, eight hundred fifteen".