6400604642 has 4 divisors (see below), whose sum is σ = 9600906966. Its totient is φ = 3200302320.

The previous prime is 6400604641. The next prime is 6400604699. The reversal of 6400604642 is 2464060046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6396960361 + 3644281 = 79981^2 + 1909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6400604599 and 6400604608.

It is not an unprimeable number, because it can be changed into a prime (6400604641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600151159 + ... + 1600151162.

Almost surely, 2^6400604642 is an apocalyptic number.

6400604642 is a deficient number, since it is larger than the sum of its proper divisors (3200302324).

6400604642 is a wasteful number, since it uses less digits than its factorization.

6400604642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200302323.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 6400604642 is about 80003.7789232484. The cubic root of 6400604642 is about 1856.6940003447.

Adding to 6400604642 its reverse (2464060046), we get a palindrome (8864664688).

The spelling of 6400604642 in words is "six billion, four hundred million, six hundred four thousand, six hundred forty-two".