635996997 has 24 divisors (see below), whose sum is σ = 940133376. Its totient is φ = 414125856.

The previous prime is 635996993. The next prime is 635997007. The reversal of 635996997 is 799699536.

It is not a de Polignac number, because 635996997 - 2² = 635996993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635996993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255523 + ... + 257999.

It is an arithmetic number, because the mean of its divisors is an integer number (39172224).

Almost surely, 2^635996997 is an apocalyptic number.

It is an amenable number.

635996997 is a deficient number, since it is larger than the sum of its proper divisors (304136379).

635996997 is a wasteful number, since it uses less digits than its factorization.

635996997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3134 counting only the distinct ones).

The product of its digits is 24800580, while the sum is 63.

The square root of 635996997 is about 25218.9808874189. The cubic root of 635996997 is about 859.9734068755.

The spelling of 635996997 in words is "six hundred thirty-five million, nine hundred ninety-six thousand, nine hundred ninety-seven".