72900173778 has 16 divisors (see below), whose sum is σ = 145828400160. Its totient is φ = 24295382496.

The previous prime is 72900173767. The next prime is 72900173833. The reversal of 72900173778 is 87737100927.

It is a self number, because there is not a number n which added to its sum of digits gives 72900173778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135000 + ... + 1197507.

It is an arithmetic number, because the mean of its divisors is an integer number (9114275010).

Almost surely, 2^72900173778 is an apocalyptic number.

72900173778 is an abundant number, since it is smaller than the sum of its proper divisors (72928226382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72900173778 is a wasteful number, since it uses less digits than its factorization.

72900173778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337721.

The product of its (nonzero) digits is 1037232, while the sum is 51.

The spelling of 72900173778 in words is "seventy-two billion, nine hundred million, one hundred seventy-three thousand, seven hundred seventy-eight".