202688890 has 16 divisors (see below), whose sum is σ = 365565960. Its totient is φ = 80914240.

The previous prime is 202688861. The next prime is 202688911. The reversal of 202688890 is 98886202.

It can be written as a sum of positive squares in 4 ways, for example, as 193682889 + 9006001 = 13917^2 + 3001^2 .

It is a super-2 number, since 2×202688890² = 82165572258864200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14821 + ... + 25000.

Almost surely, 2^202688890 is an apocalyptic number.

202688890 is a deficient number, since it is larger than the sum of its proper divisors (162877070).

202688890 is a wasteful number, since it uses less digits than its factorization.

202688890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40337.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 202688890 is about 14236.8848418465. The cubic root of 202688890 is about 587.4126769263.

The spelling of 202688890 in words is "two hundred two million, six hundred eighty-eight thousand, eight hundred ninety".