205010978 has 4 divisors (see below), whose sum is σ = 307516470. Its totient is φ = 102505488.

The previous prime is 205010977. The next prime is 205010987. The reversal of 205010978 is 879010502.

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

It can be written as a sum of positive squares in only one way, i.e., 159946609 + 45064369 = 12647^2 + 6713^2 .

It is a super-2 number, since 2×205010978² = 84059002201032968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205010977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51252743 + ... + 51252746.

Almost surely, 2^205010978 is an apocalyptic number.

205010978 is a deficient number, since it is larger than the sum of its proper divisors (102505492).

205010978 is a wasteful number, since it uses less digits than its factorization.

205010978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102505491.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 205010978 is about 14318.2044265334. The cubic root of 205010978 is about 589.6473790667.

The spelling of 205010978 in words is "two hundred five million, ten thousand, nine hundred seventy-eight".