202642645 has 8 divisors (see below), whose sum is σ = 243347256. Its totient is φ = 161996736.

The previous prime is 202642637. The next prime is 202642651. The reversal of 202642645 is 546246202.

It can be written as a sum of positive squares in 4 ways, for example, as 146482609 + 56160036 = 12103^2 + 7494^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 202642645 - 2³ = 202642637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6682 + ... + 21211.

It is an arithmetic number, because the mean of its divisors is an integer number (30418407).

Almost surely, 2^202642645 is an apocalyptic number.

It is an amenable number.

202642645 is a deficient number, since it is larger than the sum of its proper divisors (40704611).

202642645 is a wasteful number, since it uses less digits than its factorization.

202642645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29351.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 202642645 is about 14235.2606228337. The cubic root of 202642645 is about 587.3679993164.

Adding to 202642645 its reverse (546246202), we get a palindrome (748888847).

It can be divided in two parts, 20 and 2642645, that multiplied together give a square (52852900 = 7270²).

The spelling of 202642645 in words is "two hundred two million, six hundred forty-two thousand, six hundred forty-five".