7648561 has 4 divisors (see below), whose sum is σ = 7654500. Its totient is φ = 7642624.

The previous prime is 7648559. The next prime is 7648609. The reversal of 7648561 is 1658467.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1658467 = 43 ⋅38569.

It can be written as a sum of positive squares in 2 ways, for example, as 2742336 + 4906225 = 1656^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 7648561 - 2¹ = 7648559 is a prime.

It is a super-3 number, since 3×7648561³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7648561.

It is not an unprimeable number, because it can be changed into a prime (7648061) 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, 136 + ... + 3913.

It is an arithmetic number, because the mean of its divisors is an integer number (1913625).

Almost surely, 2^7648561 is an apocalyptic number.

It is an amenable number.

7648561 is a deficient number, since it is larger than the sum of its proper divisors (5939).

7648561 is a wasteful number, since it uses less digits than its factorization.

7648561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938.

The product of its digits is 40320, while the sum is 37.

The square root of 7648561 is about 2765.6031891795. The cubic root of 7648561 is about 197.0273781596.

The spelling of 7648561 in words is "seven million, six hundred forty-eight thousand, five hundred sixty-one".