202400640634 has 8 divisors (see below), whose sum is σ = 303603948180. Its totient is φ = 101199324576.

The previous prime is 202400640569. The next prime is 202400640653. The reversal of 202400640634 is 436046004202.

It can be written as a sum of positive squares in 2 ways, for example, as 198412339225 + 3988301409 = 445435^2 + 63153^2 .

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

It is a super-2 number, since 2×202400640634² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 202400640596 and 202400640605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210649 + ... + 670204.

Almost surely, 2^202400640634 is an apocalyptic number.

202400640634 is a deficient number, since it is larger than the sum of its proper divisors (101203307546).

202400640634 is a wasteful number, since it uses less digits than its factorization.

202400640634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995744.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 202400640634 its reverse (436046004202), we get a palindrome (638446644836).

The spelling of 202400640634 in words is "two hundred two billion, four hundred million, six hundred forty thousand, six hundred thirty-four".