12887640390 has 32 divisors (see below), whose sum is σ = 30933927936. Its totient is φ = 3436305120.

The previous prime is 12887640361. The next prime is 12887640391. The reversal of 12887640390 is 9304678821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12887640391) 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, 312729 + ... + 351531.

It is an arithmetic number, because the mean of its divisors is an integer number (966685248).

Almost surely, 2^12887640390 is an apocalyptic number.

12887640390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12887640390 is an abundant number, since it is smaller than the sum of its proper divisors (18046287546).

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

12887640390 is a wasteful number, since it uses less digits than its factorization.

12887640390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49884.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 12887640390 in words is "twelve billion, eight hundred eighty-seven million, six hundred forty thousand, three hundred ninety".