7628739 has 4 divisors (see below), whose sum is σ = 10171656. Its totient is φ = 5085824.

The previous prime is 7628723. The next prime is 7628741. The reversal of 7628739 is 9378267.

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

It is a cyclic number.

It is not a de Polignac number, because 7628739 - 2⁴ = 7628723 is a prime.

7628739 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7628739.

It is not an unprimeable number, because it can be changed into a prime (7628039) 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 3 ways as a sum of consecutive naturals, for example, 1271454 + ... + 1271459.

It is an arithmetic number, because the mean of its divisors is an integer number (2542914).

Almost surely, 2^7628739 is an apocalyptic number.

7628739 is a deficient number, since it is larger than the sum of its proper divisors (2542917).

7628739 is a wasteful number, since it uses less digits than its factorization.

7628739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542916.

The product of its digits is 127008, while the sum is 42.

The square root of 7628739 is about 2762.0171976293. The cubic root of 7628739 is about 196.8570256203.

The spelling of 7628739 in words is "seven million, six hundred twenty-eight thousand, seven hundred thirty-nine".