72446538 has 8 divisors (see below), whose sum is σ = 144893088. Its totient is φ = 24148844.

The previous prime is 72446533. The next prime is 72446557. The reversal of 72446538 is 83564427.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

72446538 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 72446496 and 72446505.

It is not an unprimeable number, because it can be changed into a prime (72446533) 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, 6037206 + ... + 6037217.

It is an arithmetic number, because the mean of its divisors is an integer number (18111636).

Almost surely, 2^72446538 is an apocalyptic number.

72446538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

72446538 is a wasteful number, since it uses less digits than its factorization.

72446538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12074428.

The product of its digits is 161280, while the sum is 39.

The square root of 72446538 is about 8511.5532072589. The cubic root of 72446538 is about 416.8750265272.

The spelling of 72446538 in words is "seventy-two million, four hundred forty-six thousand, five hundred thirty-eight".