72745522 has 8 divisors (see below), whose sum is σ = 110613276. Its totient is φ = 35874432.

The previous prime is 72745459. The next prime is 72745549. The reversal of 72745522 is 22554727.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72743841 + 1681 = 8529^2 + 41^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248983 + ... + 249274.

Almost surely, 2^72745522 is an apocalyptic number.

72745522 is a deficient number, since it is larger than the sum of its proper divisors (37867754).

72745522 is a wasteful number, since it uses less digits than its factorization.

72745522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498332.

The product of its digits is 39200, while the sum is 34.

The square root of 72745522 is about 8529.0985455674. The cubic root of 72745522 is about 417.4477150153.

The spelling of 72745522 in words is "seventy-two million, seven hundred forty-five thousand, five hundred twenty-two".