72615320 has 16 divisors (see below), whose sum is σ = 163384560. Its totient is φ = 29046112.

The previous prime is 72615317. The next prime is 72615341. The reversal of 72615320 is 2351627.

It is a self number, because there is not a number n which added to its sum of digits gives 72615320.

It is a congruent number.

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, 907652 + ... + 907731.

It is an arithmetic number, because the mean of its divisors is an integer number (10211535).

Almost surely, 2^72615320 is an apocalyptic number.

It is an amenable number.

72615320 is an abundant number, since it is smaller than the sum of its proper divisors (90769240).

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

72615320 is a wasteful number, since it uses less digits than its factorization.

72615320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815394 (or 1815390 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 72615320 is about 8521.4623158235. The cubic root of 72615320 is about 417.1985130236.

Adding to 72615320 its reverse (2351627), we get a palindrome (74966947).

The spelling of 72615320 in words is "seventy-two million, six hundred fifteen thousand, three hundred twenty".