7128634 has 4 divisors (see below), whose sum is σ = 10692954. Its totient is φ = 3564316.

The previous prime is 7128619. The next prime is 7128647. The reversal of 7128634 is 4368217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4368217 = 7 ⋅624031.

It can be written as a sum of positive squares in only one way, i.e., 4422609 + 2706025 = 2103^2 + 1645^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7128596 and 7128605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1782157 + ... + 1782160.

Almost surely, 2^7128634 is an apocalyptic number.

7128634 is a deficient number, since it is larger than the sum of its proper divisors (3564320).

7128634 is a wasteful number, since it uses less digits than its factorization.

7128634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564319.

The product of its digits is 8064, while the sum is 31.

The square root of 7128634 is about 2669.9501868012. The cubic root of 7128634 is about 192.4577655138.

The spelling of 7128634 in words is "seven million, one hundred twenty-eight thousand, six hundred thirty-four".