72444557 has 8 divisors (see below), whose sum is σ = 74784000. Its totient is φ = 70125264.

The previous prime is 72444539. The next prime is 72444563. The reversal of 72444557 is 75544427.

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

It is a cyclic number.

It is not a de Polignac number, because 72444557 - 2⁸ = 72444301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72444557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72444527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2444 + ... + 12282.

It is an arithmetic number, because the mean of its divisors is an integer number (9348000).

Almost surely, 2^72444557 is an apocalyptic number.

It is an amenable number.

72444557 is a deficient number, since it is larger than the sum of its proper divisors (2339443).

72444557 is a wasteful number, since it uses less digits than its factorization.

72444557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10075.

The product of its digits is 156800, while the sum is 38.

The square root of 72444557 is about 8511.4368352235. The cubic root of 72444557 is about 416.8712267737.

The spelling of 72444557 in words is "seventy-two million, four hundred forty-four thousand, five hundred fifty-seven".