7488721 has 8 divisors (see below), whose sum is σ = 7957224. Its totient is φ = 7023360.

The previous prime is 7488713. The next prime is 7488737. The reversal of 7488721 is 1278847.

It can be written as a sum of positive squares in 4 ways, for example, as 3920400 + 3568321 = 1980^2 + 1889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7488721 - 2³ = 7488713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7488521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5751 + ... + 6931.

It is an arithmetic number, because the mean of its divisors is an integer number (994653).

Almost surely, 2^7488721 is an apocalyptic number.

It is an amenable number.

7488721 is a deficient number, since it is larger than the sum of its proper divisors (468503).

7488721 is a wasteful number, since it uses less digits than its factorization.

7488721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 25088, while the sum is 37.

The square root of 7488721 is about 2736.5527584901. The cubic root of 7488721 is about 195.6452088463.

The spelling of 7488721 in words is "seven million, four hundred eighty-eight thousand, seven hundred twenty-one".