7287720 has 64 divisors (see below), whose sum is σ = 23855040. Its totient is φ = 1766400.

The previous prime is 7287703. The next prime is 7287727. The reversal of 7287720 is 277827.

It is a happy number.

It is a super-2 number, since 2×7287720² = 106221725596800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (7287727) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1441 + ... + 4080.

It is an arithmetic number, because the mean of its divisors is an integer number (372735).

Almost surely, 2^7287720 is an apocalyptic number.

It is an amenable number.

7287720 is an abundant number, since it is smaller than the sum of its proper divisors (16567320).

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

7287720 is a wasteful number, since it uses less digits than its factorization.

7287720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546 (or 5542 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 7287720 is about 2699.5777447594. The cubic root of 7287720 is about 193.8789055462.

It can be divided in two parts, 728 and 7720, that added together give a palindrome (8448).

The spelling of 7287720 in words is "seven million, two hundred eighty-seven thousand, seven hundred twenty".