204631978 has 8 divisors (see below), whose sum is σ = 315243972. Its totient is φ = 99550656.

The previous prime is 204631967. The next prime is 204631979. The reversal of 204631978 is 879136402.

It can be written as a sum of positive squares in 2 ways, for example, as 204575809 + 56169 = 14303^2 + 237^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 204631978.

It is not an unprimeable number, because it can be changed into a prime (204631979) 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, 1382575 + ... + 1382722.

Almost surely, 2^204631978 is an apocalyptic number.

204631978 is a deficient number, since it is larger than the sum of its proper divisors (110611994).

204631978 is a wasteful number, since it uses less digits than its factorization.

204631978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765336.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 204631978 is about 14304.9634043572. The cubic root of 204631978 is about 589.2837981947.

The spelling of 204631978 in words is "two hundred four million, six hundred thirty-one thousand, nine hundred seventy-eight".