7521616 has 20 divisors (see below), whose sum is σ = 15430932. Its totient is φ = 3539456.

The previous prime is 7521607. The next prime is 7521617. The reversal of 7521616 is 6161257.

It can be written as a sum of positive squares in 2 ways, for example, as 2250000 + 5271616 = 1500^2 + 2296^2 .

7521616 is a modest number, since divided by 1616 gives 752 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7521617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13555 + ... + 14098.

Almost surely, 2^7521616 is an apocalyptic number.

It is an amenable number.

7521616 is an abundant number, since it is smaller than the sum of its proper divisors (7909316).

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

7521616 is a wasteful number, since it uses less digits than its factorization.

7521616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27678 (or 27672 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 7521616 is about 2742.5564716155. The cubic root of 7521616 is about 195.9312545248.

The spelling of 7521616 in words is "seven million, five hundred twenty-one thousand, six hundred sixteen".