72778375 has 8 divisors (see below), whose sum is σ = 90827568. Its totient is φ = 58222600.

The previous prime is 72778369. The next prime is 72778393. The reversal of 72778375 is 57387727.

It is a de Polignac number, because none of the positive numbers 2^k-72778375 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290989 + ... + 291238.

It is an arithmetic number, because the mean of its divisors is an integer number (11353446).

Almost surely, 2^72778375 is an apocalyptic number.

72778375 is a deficient number, since it is larger than the sum of its proper divisors (18049193).

72778375 is an equidigital number, since it uses as much as digits as its factorization.

72778375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582242 (or 582232 counting only the distinct ones).

The product of its digits is 576240, while the sum is 46.

The square root of 72778375 is about 8531.0242644128. The cubic root of 72778375 is about 417.5105475003.

It can be divided in two parts, 72778 and 375, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 72778375 in words is "seventy-two million, seven hundred seventy-eight thousand, three hundred seventy-five".