72775444 has 24 divisors (see below), whose sum is σ = 145748288. Its totient is φ = 31147200.

The previous prime is 72775433. The next prime is 72775457. The reversal of 72775444 is 44457727.

It is a junction number, because it is equal to n+sod(n) for n = 72775397 and 72775406.

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 7 ways as a sum of consecutive naturals, for example, 28192 + ... + 30664.

Almost surely, 2^72775444 is an apocalyptic number.

It is an amenable number.

72775444 is an abundant number, since it is smaller than the sum of its proper divisors (72972844).

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

72775444 is a wasteful number, since it uses less digits than its factorization.

72775444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535 (or 3533 counting only the distinct ones).

The product of its digits is 219520, while the sum is 40.

The square root of 72775444 is about 8530.8524779180. The cubic root of 72775444 is about 417.5049426310.

It can be divided in two parts, 7277 and 5444, that added together give a palindrome (12721).

The spelling of 72775444 in words is "seventy-two million, seven hundred seventy-five thousand, four hundred forty-four".