645104390 has 16 divisors (see below), whose sum is σ = 1327072032. Its totient is φ = 221178624.

The previous prime is 645104381. The next prime is 645104419. The reversal of 645104390 is 93401546.

It is a congruent number.

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, 4607819 + ... + 4607958.

It is an arithmetic number, because the mean of its divisors is an integer number (82942002).

Almost surely, 2^645104390 is an apocalyptic number.

645104390 is an abundant number, since it is smaller than the sum of its proper divisors (681967642).

645104390 is a wasteful number, since it uses less digits than its factorization.

645104390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9215791.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 645104390 is about 25398.9052913703. The cubic root of 645104390 is about 864.0588692670.

The spelling of 645104390 in words is "six hundred forty-five million, one hundred four thousand, three hundred ninety".