18994913280 has 672 divisors, whose sum is σ = 79862013504. Its totient is φ = 4076863488.

The previous prime is 18994913233. The next prime is 18994913293. The reversal of 18994913280 is 8231949981.

It is a tau number, because it is divible by the number of its divisors (672).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43867944 + ... + 43868376.

It is an arithmetic number, because the mean of its divisors is an integer number (118842282).

Almost surely, 2^18994913280 is an apocalyptic number.

18994913280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18994913280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39931006752).

18994913280 is an abundant number, since it is smaller than the sum of its proper divisors (60867100224).

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

18994913280 is a wasteful number, since it uses less digits than its factorization.

18994913280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 18994913280 in words is "eighteen billion, nine hundred ninety-four million, nine hundred thirteen thousand, two hundred eighty".