642905098 has 16 divisors (see below), whose sum is σ = 1054969920. Its totient is φ = 291412000.

The previous prime is 642905069. The next prime is 642905119. The reversal of 642905098 is 890509246.

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 in 7 ways as a sum of consecutive naturals, for example, 32803 + ... + 48598.

It is an arithmetic number, because the mean of its divisors is an integer number (65935620).

Almost surely, 2^642905098 is an apocalyptic number.

642905098 is a deficient number, since it is larger than the sum of its proper divisors (412064822).

642905098 is a wasteful number, since it uses less digits than its factorization.

642905098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81773.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 642905098 is about 25355.5733123903. The cubic root of 642905098 is about 863.0758338540.

The spelling of 642905098 in words is "six hundred forty-two million, nine hundred five thousand, ninety-eight".