205136428 has 12 divisors (see below), whose sum is σ = 410272912. Its totient is φ = 87915600.

The previous prime is 205136417. The next prime is 205136429. The reversal of 205136428 is 824631502.

205136428 is an admirable number.

It is a super-3 number, since 3×205136428³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 205136428.

It is not an unprimeable number, because it can be changed into a prime (205136429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3663123 + ... + 3663178.

Almost surely, 2^205136428 is an apocalyptic number.

205136428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

205136428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

205136428 is a wasteful number, since it uses less digits than its factorization.

205136428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7326312 (or 7326310 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 205136428 is about 14322.5845433008. The cubic root of 205136428 is about 589.7676265797.

The spelling of 205136428 in words is "two hundred five million, one hundred thirty-six thousand, four hundred twenty-eight".