634787 has 4 divisors (see below), whose sum is σ = 655296. Its totient is φ = 614280.

The previous prime is 634759. The next prime is 634793. The reversal of 634787 is 787436.

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 634787 - 2⁸ = 634531 is a prime.

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

It is a Duffinian number.

It is a plaindrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 634787.

It is not an unprimeable number, because it can be changed into a prime (634717) 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, 10208 + ... + 10269.

It is an arithmetic number, because the mean of its divisors is an integer number (163824).

2⁶³⁴⁷⁸⁷ is an apocalyptic number.

634787 is a deficient number, since it is larger than the sum of its proper divisors (20509).

634787 is a wasteful number, since it uses less digits than its factorization.

634787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20508.

The product of its digits is 28224, while the sum is 35.

The square root of 634787 is about 796.7352132296. The cubic root of 634787 is about 85.9427688450.

The spelling of 634787 in words is "six hundred thirty-four thousand, seven hundred eighty-seven".