202042640 has 40 divisors (see below), whose sum is σ = 470678208. Its totient is φ = 80657280.

The previous prime is 202042639. The next prime is 202042651. The reversal of 202042640 is 46240202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 43469 + ... + 47891.

Almost surely, 2^202042640 is an apocalyptic number.

202042640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202042640 is an abundant number, since it is smaller than the sum of its proper divisors (268635568).

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

202042640 is a wasteful number, since it uses less digits than its factorization.

202042640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007 (or 5001 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 202042640 is about 14214.1703943635. The cubic root of 202042640 is about 586.7877132001.

Adding to 202042640 its reverse (46240202), we get a palindrome (248282842).

The spelling of 202042640 in words is "two hundred two million, forty-two thousand, six hundred forty".