634962681 has 6 divisors (see below), whose sum is σ = 917168330. Its totient is φ = 423308448.

The previous prime is 634962667. The next prime is 634962683. The reversal of 634962681 is 186269436.

634962681 is a `hidden beast` number, since 63 + 496 + 26 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 337089600 + 297873081 = 18360^2 + 17259^2 .

It is not a de Polignac number, because 634962681 - 2⁵ = 634962649 is a prime.

It is a super-2 number, since 2×634962681² = 806355212525415522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634962683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35275696 + ... + 35275713.

Almost surely, 2^634962681 is an apocalyptic number.

It is an amenable number.

634962681 is a deficient number, since it is larger than the sum of its proper divisors (282205649).

634962681 is a wasteful number, since it uses less digits than its factorization.

634962681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70551415 (or 70551412 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 634962681 is about 25198.4658461582. The cubic root of 634962681 is about 859.5069650101.

The spelling of 634962681 in words is "six hundred thirty-four million, nine hundred sixty-two thousand, six hundred eighty-one".