642986049 has 16 divisors (see below), whose sum is σ = 911206400. Its totient is φ = 402150096.

The previous prime is 642986039. The next prime is 642986051. The reversal of 642986049 is 940689246.

It is not a de Polignac number, because 642986049 - 2⁷ = 642985921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642985989 and 642986007.

It is not an unprimeable number, because it can be changed into a prime (642986039) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 48889 + ... + 60630.

It is an arithmetic number, because the mean of its divisors is an integer number (56950400).

Almost surely, 2^642986049 is an apocalyptic number.

It is an amenable number.

642986049 is a deficient number, since it is larger than the sum of its proper divisors (268220351).

642986049 is a wasteful number, since it uses less digits than its factorization.

642986049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109644.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 642986049 is about 25357.1695778531. The cubic root of 642986049 is about 863.1120568880.

The spelling of 642986049 in words is "six hundred forty-two million, nine hundred eighty-six thousand, forty-nine".