7538661 has 12 divisors (see below), whose sum is σ = 11726988. Its totient is φ = 4639104.

The previous prime is 7538651. The next prime is 7538683. The reversal of 7538661 is 1668357.

It can be written as a sum of positive squares in 2 ways, for example, as 2160900 + 5377761 = 1470^2 + 2319^2 .

It is not a de Polignac number, because 7538661 - 2⁷ = 7538533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7538651) 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 11 ways as a sum of consecutive naturals, for example, 32100 + ... + 32333.

It is an arithmetic number, because the mean of its divisors is an integer number (977249).

Almost surely, 2^7538661 is an apocalyptic number.

It is an amenable number.

7538661 is a deficient number, since it is larger than the sum of its proper divisors (4188327).

7538661 is a wasteful number, since it uses less digits than its factorization.

7538661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64452 (or 64449 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 7538661 is about 2745.6622152042. The cubic root of 7538661 is about 196.0791451158.

The spelling of 7538661 in words is "seven million, five hundred thirty-eight thousand, six hundred sixty-one".