205149078 has 32 divisors (see below), whose sum is σ = 465592320. Its totient is φ = 66927240.

The previous prime is 205149071. The next prime is 205149101. The reversal of 205149078 is 870941502.

205149078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×205149078² = 84172288408500168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205149071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37878 + ... + 42953.

It is an arithmetic number, because the mean of its divisors is an integer number (14549760).

Almost surely, 2^205149078 is an apocalyptic number.

205149078 is an abundant number, since it is smaller than the sum of its proper divisors (260443242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205149078 is a wasteful number, since it uses less digits than its factorization.

205149078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80889 (or 80883 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 205149078 is about 14323.0261467331. The cubic root of 205149078 is about 589.7797492553.

It can be divided in two parts, 20514 and 9078, that added together give a palindrome (29592).

The spelling of 205149078 in words is "two hundred five million, one hundred forty-nine thousand, seventy-eight".