816388287500 has 36 divisors (see below), whose sum is σ = 1785735111888. Its totient is φ = 326555310000.

The previous prime is 816388287469. The next prime is 816388287503. The reversal of 816388287500 is 5782883618.

It is not an unprimeable number, because it can be changed into a prime (816388287503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32643032 + ... + 32668031.

It is an arithmetic number, because the mean of its divisors is an integer number (49603753108).

Almost surely, 2^816388287500 is an apocalyptic number.

It is an amenable number.

816388287500 is an abundant number, since it is smaller than the sum of its proper divisors (969346824388).

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

816388287500 is an equidigital number, since it uses as much as digits as its factorization.

816388287500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65311092 (or 65311070 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 816388287500 in words is "eight hundred sixteen billion, three hundred eighty-eight million, two hundred eighty-seven thousand, five hundred".