72553220 has 12 divisors (see below), whose sum is σ = 152361804. Its totient is φ = 29021280.

The previous prime is 72553219. The next prime is 72553241. The reversal of 72553220 is 2235527.

It can be written as a sum of positive squares in 2 ways, for example, as 36168196 + 36385024 = 6014^2 + 6032^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72553220.

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, 1813811 + ... + 1813850.

It is an arithmetic number, because the mean of its divisors is an integer number (12696817).

Almost surely, 2^72553220 is an apocalyptic number.

It is an amenable number.

72553220 is an abundant number, since it is smaller than the sum of its proper divisors (79808584).

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

72553220 is a wasteful number, since it uses less digits than its factorization.

72553220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627670 (or 3627668 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 72553220 is about 8517.8177956563. The cubic root of 72553220 is about 417.0795509065.

Adding to 72553220 its reverse (2235527), we get a palindrome (74788747).

The spelling of 72553220 in words is "seventy-two million, five hundred fifty-three thousand, two hundred twenty".