72778854506 has 8 divisors (see below), whose sum is σ = 113914728864. Its totient is φ = 34807278220.

The previous prime is 72778854469. The next prime is 72778854523. The reversal of 72778854506 is 60545887727.

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

It is a Curzon 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, 791074460 + ... + 791074551.

It is an arithmetic number, because the mean of its divisors is an integer number (14239341108).

Almost surely, 2^72778854506 is an apocalyptic number.

72778854506 is a deficient number, since it is larger than the sum of its proper divisors (41135874358).

72778854506 is a wasteful number, since it uses less digits than its factorization.

72778854506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582149036.

The product of its (nonzero) digits is 26342400, while the sum is 59.

The spelling of 72778854506 in words is "seventy-two billion, seven hundred seventy-eight million, eight hundred fifty-four thousand, five hundred six".