642844102 has 16 divisors (see below), whose sum is σ = 1016342640. Its totient is φ = 304481632.

The previous prime is 642844099. The next prime is 642844129. The reversal of 642844102 is 201448246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101488 + ... + 107635.

It is an arithmetic number, because the mean of its divisors is an integer number (63521415).

Almost surely, 2^642844102 is an apocalyptic number.

642844102 is a deficient number, since it is larger than the sum of its proper divisors (373498538).

642844102 is a wasteful number, since it uses less digits than its factorization.

642844102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209207.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 642844102 is about 25354.3704713803. The cubic root of 642844102 is about 863.0485380480.

It can be divided in two parts, 64284 and 4102, that added together give a palindrome (68386).

The spelling of 642844102 in words is "six hundred forty-two million, eight hundred forty-four thousand, one hundred two".