646642104 has 32 divisors (see below), whose sum is σ = 1623557520. Its totient is φ = 214620416.

The previous prime is 646642099. The next prime is 646642109. The reversal of 646642104 is 401246646.

It is an interprime number because it is at equal distance from previous prime (646642099) and next prime (646642109).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646642109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52227 + ... + 63410.

Almost surely, 2^646642104 is an apocalyptic number.

It is an amenable number.

646642104 is an abundant number, since it is smaller than the sum of its proper divisors (976915416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646642104 is a wasteful number, since it uses less digits than its factorization.

646642104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115879 (or 115875 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 646642104 is about 25429.1585389686. The cubic root of 646642104 is about 864.7448673421.

The spelling of 646642104 in words is "six hundred forty-six million, six hundred forty-two thousand, one hundred four".