642409642 has 16 divisors (see below), whose sum is σ = 1149155712. Its totient is φ = 263347920.

The previous prime is 642409631. The next prime is 642409643. The reversal of 642409642 is 246904246.

It is not an unprimeable number, because it can be changed into a prime (642409643) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 997209 + ... + 997852.

It is an arithmetic number, because the mean of its divisors is an integer number (71822232).

Almost surely, 2^642409642 is an apocalyptic number.

642409642 is a deficient number, since it is larger than the sum of its proper divisors (506746070).

642409642 is a wasteful number, since it uses less digits than its factorization.

642409642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995093.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 642409642 is about 25345.8012696383. The cubic root of 642409642 is about 862.8540665478.

The spelling of 642409642 in words is "six hundred forty-two million, four hundred nine thousand, six hundred forty-two".