634478747 has 4 divisors (see below), whose sum is σ = 725118576. Its totient is φ = 543838920.

The previous prime is 634478737. The next prime is 634478771. The reversal of 634478747 is 747874436.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634478747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634478695 and 634478704.

It is not an unprimeable number, because it can be changed into a prime (634478707) 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, 45319904 + ... + 45319917.

It is an arithmetic number, because the mean of its divisors is an integer number (181279644).

Almost surely, 2^634478747 is an apocalyptic number.

634478747 is a deficient number, since it is larger than the sum of its proper divisors (90639829).

634478747 is an equidigital number, since it uses as much as digits as its factorization.

634478747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90639828.

The product of its digits is 3161088, while the sum is 50.

The square root of 634478747 is about 25188.8615661764. The cubic root of 634478747 is about 859.2885530357.

The spelling of 634478747 in words is "six hundred thirty-four million, four hundred seventy-eight thousand, seven hundred forty-seven".