72216570 has 16 divisors (see below), whose sum is σ = 173319840. Its totient is φ = 19257744.

The previous prime is 72216541. The next prime is 72216631. The reversal of 72216570 is 7561227.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2407219 = 72216570 / (7 + 2 + 2 + 1 + 6 + 5 + 7 + 0).

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, 1203580 + ... + 1203639.

It is an arithmetic number, because the mean of its divisors is an integer number (10832490).

Almost surely, 2^72216570 is an apocalyptic number.

72216570 is an abundant number, since it is smaller than the sum of its proper divisors (101103270).

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

72216570 is a wasteful number, since it uses less digits than its factorization.

72216570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407229.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 72216570 is about 8498.0333018881. The cubic root of 72216570 is about 416.4334616792.

Adding to 72216570 its reverse (7561227), we get a palindrome (79777797).

The spelling of 72216570 in words is "seventy-two million, two hundred sixteen thousand, five hundred seventy".