72442320 has 40 divisors (see below), whose sum is σ = 224571936. Its totient is φ = 19317888.

The previous prime is 72442313. The next prime is 72442333. The reversal of 72442320 is 2324427.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150682 + ... + 151161.

Almost surely, 2^72442320 is an apocalyptic number.

It is an amenable number.

72442320 is an abundant number, since it is smaller than the sum of its proper divisors (152129616).

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

72442320 is a wasteful number, since it uses less digits than its factorization.

72442320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301859 (or 301853 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 72442320 is about 8511.3054227892. The cubic root of 72442320 is about 416.8669359037.

Adding to 72442320 its reverse (2324427), we get a palindrome (74766747).

The spelling of 72442320 in words is "seventy-two million, four hundred forty-two thousand, three hundred twenty".