7215720 has 64 divisors (see below), whose sum is σ = 21841920. Its totient is φ = 1906944.

The previous prime is 7215709. The next prime is 7215739. The reversal of 7215720 is 275127.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18649 + ... + 19031.

It is an arithmetic number, because the mean of its divisors is an integer number (341280).

Almost surely, 2^7215720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7215720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10920960).

7215720 is an abundant number, since it is smaller than the sum of its proper divisors (14626200).

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

7215720 is a wasteful number, since it uses less digits than its factorization.

7215720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 7215720 is about 2686.2092249116. The cubic root of 7215720 is about 193.2383071124.

It can be divided in two parts, 721 and 5720, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 7215720 in words is "seven million, two hundred fifteen thousand, seven hundred twenty".