640308104 has 16 divisors (see below), whose sum is σ = 1217488320. Its totient is φ = 315644560.

The previous prime is 640308103. The next prime is 640308143. The reversal of 640308104 is 401803046.

It is not an unprimeable number, because it can be changed into a prime (640308103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563084 + ... + 564219.

It is an arithmetic number, because the mean of its divisors is an integer number (76093020).

Almost surely, 2^640308104 is an apocalyptic number.

It is an amenable number.

640308104 is a deficient number, since it is larger than the sum of its proper divisors (577180216).

640308104 is a wasteful number, since it uses less digits than its factorization.

640308104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127380 (or 1127376 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 640308104 is about 25304.3099886166. The cubic root of 640308104 is about 861.9121433993.

The spelling of 640308104 in words is "six hundred forty million, three hundred eight thousand, one hundred four".