7212780 has 144 divisors (see below), whose sum is σ = 24323040. Its totient is φ = 1772928.

The previous prime is 7212773. The next prime is 7212791. The reversal of 7212780 is 872127.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 194922 + ... + 194958.

It is an arithmetic number, because the mean of its divisors is an integer number (168910).

Almost surely, 2^7212780 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 7212780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12161520).

7212780 is an abundant number, since it is smaller than the sum of its proper divisors (17110260).

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

7212780 is a wasteful number, since it uses less digits than its factorization.

7212780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 7212780 is about 2685.6619295809. The cubic root of 7212780 is about 193.2120589672.

The spelling of 7212780 in words is "seven million, two hundred twelve thousand, seven hundred eighty".