634697669 has 4 divisors (see below), whose sum is σ = 672032844. Its totient is φ = 597362496.

The previous prime is 634697659. The next prime is 634697711. The reversal of 634697669 is 966796436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 430064644 + 204633025 = 20738^2 + 14305^2 .

It is a cyclic number.

It is not a de Polignac number, because 634697669 - 2²⁴ = 617920453 is a prime.

It is a super-2 number, since 2×634697669² = 805682262068067122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634697629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18667562 + ... + 18667595.

It is an arithmetic number, because the mean of its divisors is an integer number (168008211).

Almost surely, 2^634697669 is an apocalyptic number.

It is an amenable number.

634697669 is a deficient number, since it is larger than the sum of its proper divisors (37335175).

634697669 is a wasteful number, since it uses less digits than its factorization.

634697669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37335174.

The product of its digits is 8817984, while the sum is 56.

The square root of 634697669 is about 25193.2068026284. The cubic root of 634697669 is about 859.3873719678.

The spelling of 634697669 in words is "six hundred thirty-four million, six hundred ninety-seven thousand, six hundred sixty-nine".