204978345 has 32 divisors (see below), whose sum is σ = 385305984. Its totient is φ = 91737600.

The previous prime is 204978341. The next prime is 204978353. The reversal of 204978345 is 543879402.

It is not a de Polignac number, because 204978345 - 2² = 204978341 is a prime.

It is a super-2 number, since 2×204978345² = 84032243837878050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204978297 and 204978306.

It is not an unprimeable number, because it can be changed into a prime (204978341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45636 + ... + 49925.

It is an arithmetic number, because the mean of its divisors is an integer number (12040812).

Almost surely, 2^204978345 is an apocalyptic number.

It is an amenable number.

204978345 is a deficient number, since it is larger than the sum of its proper divisors (180327639).

204978345 is a wasteful number, since it uses less digits than its factorization.

204978345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95593.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 204978345 is about 14317.0648179017. The cubic root of 204978345 is about 589.6160913374.

The spelling of 204978345 in words is "two hundred four million, nine hundred seventy-eight thousand, three hundred forty-five".