6490720442 has 4 divisors (see below), whose sum is σ = 9736080666. Its totient is φ = 3245360220.

The previous prime is 6490720429. The next prime is 6490720469. The reversal of 6490720442 is 2440270946.

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., 5852097001 + 638623441 = 76499^2 + 25271^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6490720396 and 6490720405.

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 as a sum of consecutive naturals, namely, 1622680109 + ... + 1622680112.

Almost surely, 2^6490720442 is an apocalyptic number.

6490720442 is a deficient number, since it is larger than the sum of its proper divisors (3245360224).

6490720442 is a wasteful number, since it uses less digits than its factorization.

6490720442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245360223.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 6490720442 is about 80565.0075529072. The cubic root of 6490720442 is about 1865.3670515041.

The spelling of 6490720442 in words is "six billion, four hundred ninety million, seven hundred twenty thousand, four hundred forty-two".