72755445 has 64 divisors (see below), whose sum is σ = 138240000. Its totient is φ = 32655168.

The previous prime is 72755413. The next prime is 72755447. The reversal of 72755445 is 54455727.

It is not a de Polignac number, because 72755445 - 2⁵ = 72755413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72755447) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 406366 + ... + 406544.

It is an arithmetic number, because the mean of its divisors is an integer number (2160000).

Almost surely, 2^72755445 is an apocalyptic number.

It is an amenable number.

72755445 is a deficient number, since it is larger than the sum of its proper divisors (65484555).

72755445 is a wasteful number, since it uses less digits than its factorization.

72755445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 273 counting only the distinct ones).

The product of its digits is 196000, while the sum is 39.

The square root of 72755445 is about 8529.6802401966. The cubic root of 72755445 is about 417.4666950855.

It can be divided in two parts, 7275 and 5445, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 72755445 in words is "seventy-two million, seven hundred fifty-five thousand, four hundred forty-five".