645442104 has 32 divisors (see below), whose sum is σ = 1614453120. Its totient is φ = 215034336.

The previous prime is 645442099. The next prime is 645442153. The reversal of 645442104 is 401244546.

It is a happy number.

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, 48477 + ... + 60339.

It is an arithmetic number, because the mean of its divisors is an integer number (50451660).

Almost surely, 2^645442104 is an apocalyptic number.

It is an amenable number.

645442104 is an abundant number, since it is smaller than the sum of its proper divisors (969011016).

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

645442104 is a wasteful number, since it uses less digits than its factorization.

645442104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14139 (or 14135 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 645442104 is about 25405.5526214251. The cubic root of 645442104 is about 864.2096220630.

It can be divided in two parts, 645442 and 104, that added together give a palindrome (645546).

The spelling of 645442104 in words is "six hundred forty-five million, four hundred forty-two thousand, one hundred four".