72428324 has 6 divisors (see below), whose sum is σ = 126749574. Its totient is φ = 36214160.

The previous prime is 72428287. The next prime is 72428329. The reversal of 72428324 is 42382427.

It can be written as a sum of positive squares in only one way, i.e., 66716224 + 5712100 = 8168^2 + 2390^2 .

It is not an unprimeable number, because it can be changed into a prime (72428329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9053537 + ... + 9053544.

It is an arithmetic number, because the mean of its divisors is an integer number (21124929).

Almost surely, 2^72428324 is an apocalyptic number.

It is an amenable number.

72428324 is a deficient number, since it is larger than the sum of its proper divisors (54321250).

72428324 is a wasteful number, since it uses less digits than its factorization.

72428324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18107085 (or 18107083 counting only the distinct ones).

The product of its digits is 21504, while the sum is 32.

The square root of 72428324 is about 8510.4831825226. The cubic root of 72428324 is about 416.8400876681.

The spelling of 72428324 in words is "seventy-two million, four hundred twenty-eight thousand, three hundred twenty-four".