634985649 has 40 divisors (see below), whose sum is σ = 1012543488. Its totient is φ = 395176320.

The previous prime is 634985639. The next prime is 634985669. The reversal of 634985649 is 946589436.

634985649 is a `hidden beast` number, since 63 + 498 + 56 + 49 = 666.

634985649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 634985649 - 2²⁸ = 366550193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634985595 and 634985604.

It is not an unprimeable number, because it can be changed into a prime (634985639) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 173064 + ... + 176694.

Almost surely, 2^634985649 is an apocalyptic number.

It is an amenable number.

634985649 is a deficient number, since it is larger than the sum of its proper divisors (377557839).

634985649 is a wasteful number, since it uses less digits than its factorization.

634985649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787 (or 3778 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 634985649 is about 25198.9215840678. The cubic root of 634985649 is about 859.5173283057.

The spelling of 634985649 in words is "six hundred thirty-four million, nine hundred eighty-five thousand, six hundred forty-nine".