645103004 has 48 divisors (see below), whose sum is σ = 1391781888. Its totient is φ = 254778048.

The previous prime is 645103003. The next prime is 645103009. The reversal of 645103004 is 400301546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645103003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299957 + ... + 302099.

It is an arithmetic number, because the mean of its divisors is an integer number (28995456).

Almost surely, 2^645103004 is an apocalyptic number.

It is an amenable number.

645103004 is an abundant number, since it is smaller than the sum of its proper divisors (746678884).

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

645103004 is a wasteful number, since it uses less digits than its factorization.

645103004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994 (or 2992 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 645103004 is about 25398.8780067152. The cubic root of 645103004 is about 864.0582504594.

The spelling of 645103004 in words is "six hundred forty-five million, one hundred three thousand, four".