72649428 has 12 divisors (see below), whose sum is σ = 169515360. Its totient is φ = 24216472.

The previous prime is 72649397. The next prime is 72649429. The reversal of 72649428 is 82494627.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 72649428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72649429) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3027048 + ... + 3027071.

It is an arithmetic number, because the mean of its divisors is an integer number (14126280).

Almost surely, 2^72649428 is an apocalyptic number.

It is an amenable number.

72649428 is an abundant number, since it is smaller than the sum of its proper divisors (96865932).

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

72649428 is a wasteful number, since it uses less digits than its factorization.

72649428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054126 (or 6054124 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 72649428 is about 8523.4633805748. The cubic root of 72649428 is about 417.2638232984.

The spelling of 72649428 in words is "seventy-two million, six hundred forty-nine thousand, four hundred twenty-eight".