208400313508 has 24 divisors (see below), whose sum is σ = 385374286080. Its totient is φ = 98408069760.

The previous prime is 208400313437. The next prime is 208400313551. The reversal of 208400313508 is 805313004802.

It is a happy 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, 14329573 + ... + 14344108.

It is an arithmetic number, because the mean of its divisors is an integer number (16057261920).

Almost surely, 2^208400313508 is an apocalyptic number.

It is an amenable number.

208400313508 is a deficient number, since it is larger than the sum of its proper divisors (176973972572).

208400313508 is a wasteful number, since it uses less digits than its factorization.

208400313508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28673787 (or 28673785 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 208400313508 in words is "two hundred eight billion, four hundred million, three hundred thirteen thousand, five hundred eight".