635978 has 8 divisors (see below), whose sum is σ = 1090272. Its totient is φ = 272556.

The previous prime is 635977. The next prime is 635981. The reversal of 635978 is 879536.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (635977) 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, 22700 + ... + 22727.

It is an arithmetic number, because the mean of its divisors is an integer number (136284).

2⁶³⁵⁹⁷⁸ is an apocalyptic number.

635978 is a deficient number, since it is larger than the sum of its proper divisors (454294).

635978 is a wasteful number, since it uses less digits than its factorization.

635978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45436.

The product of its digits is 45360, while the sum is 38.

The square root of 635978 is about 797.4822882046. The cubic root of 635978 is about 85.9964844426.

The spelling of 635978 in words is "six hundred thirty-five thousand, nine hundred seventy-eight".