72578224 has 10 divisors (see below), whose sum is σ = 140620340. Its totient is φ = 36289104.

The previous prime is 72578221. The next prime is 72578237. The reversal of 72578224 is 42287527.

It is not an unprimeable number, because it can be changed into a prime (72578221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2268054 + ... + 2268085.

It is an arithmetic number, because the mean of its divisors is an integer number (14062034).

Almost surely, 2^72578224 is an apocalyptic number.

It is an amenable number.

72578224 is a deficient number, since it is larger than the sum of its proper divisors (68042116).

72578224 is a wasteful number, since it uses less digits than its factorization.

72578224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536147 (or 4536141 counting only the distinct ones).

The product of its digits is 62720, while the sum is 37.

The square root of 72578224 is about 8519.2854160428. The cubic root of 72578224 is about 417.1274580810.

The spelling of 72578224 in words is "seventy-two million, five hundred seventy-eight thousand, two hundred twenty-four".