72015220 has 12 divisors (see below), whose sum is σ = 151232004. Its totient is φ = 28806080.

The previous prime is 72015211. The next prime is 72015221. The reversal of 72015220 is 2251027.

It can be written as a sum of positive squares in 2 ways, for example, as 44009956 + 28005264 = 6634^2 + 5292^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72015221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800361 + ... + 1800400.

It is an arithmetic number, because the mean of its divisors is an integer number (12602667).

Almost surely, 2^72015220 is an apocalyptic number.

It is an amenable number.

72015220 is an abundant number, since it is smaller than the sum of its proper divisors (79216784).

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

72015220 is a wasteful number, since it uses less digits than its factorization.

72015220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600770 (or 3600768 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 72015220 is about 8486.1781739485. The cubic root of 72015220 is about 416.0460763190.

Adding to 72015220 its reverse (2251027), we get a palindrome (74266247).

It can be divided in two parts, 7201 and 5220, that added together give a palindrome (12421).

The spelling of 72015220 in words is "seventy-two million, fifteen thousand, two hundred twenty".