12617989890 has 128 divisors (see below), whose sum is σ = 34090979328. Its totient is φ = 2962606080.

The previous prime is 12617989847. The next prime is 12617989933. The reversal of 12617989890 is 9898971621.

It is an interprime number because it is at equal distance from previous prime (12617989847) and next prime (12617989933).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1500277 + ... + 1508663.

It is an arithmetic number, because the mean of its divisors is an integer number (266335776).

Almost surely, 2^12617989890 is an apocalyptic number.

12617989890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12617989890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17045489664).

12617989890 is an abundant number, since it is smaller than the sum of its proper divisors (21472989438).

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

12617989890 is a wasteful number, since it uses less digits than its factorization.

12617989890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552.

The product of its (nonzero) digits is 3919104, while the sum is 60.

The spelling of 12617989890 in words is "twelve billion, six hundred seventeen million, nine hundred eighty-nine thousand, eight hundred ninety".