7638545 has 4 divisors (see below), whose sum is σ = 9166260. Its totient is φ = 6110832.

The previous prime is 7638541. The next prime is 7638557. The reversal of 7638545 is 5458367.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3411409 + 4227136 = 1847^2 + 2056^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638545 - 2² = 7638541 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 7638499 and 7638508.

It is not an unprimeable number, because it can be changed into a prime (7638541) 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, 763850 + ... + 763859.

It is an arithmetic number, because the mean of its divisors is an integer number (2291565).

Almost surely, 2^7638545 is an apocalyptic number.

It is an amenable number.

7638545 is a deficient number, since it is larger than the sum of its proper divisors (1527715).

7638545 is a wasteful number, since it uses less digits than its factorization.

7638545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527714.

The product of its digits is 100800, while the sum is 38.

The square root of 7638545 is about 2763.7917794219. The cubic root of 7638545 is about 196.9413363423.

The spelling of 7638545 in words is "seven million, six hundred thirty-eight thousand, five hundred forty-five".