18499680 has 144 divisors (see below), whose sum is σ = 65454480. Its totient is φ = 4752384.

The previous prime is 18499661. The next prime is 18499693. The reversal of 18499680 is 8699481.

18499680 = T₁₁₁₅ + T₁₁₁₆ + ... + T₁₁₄₃.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41539 + ... + 41981.

It is an arithmetic number, because the mean of its divisors is an integer number (454545).

Almost surely, 2^18499680 is an apocalyptic number.

18499680 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 18499680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32727240).

18499680 is an abundant number, since it is smaller than the sum of its proper divisors (46954800).

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

18499680 is a wasteful number, since it uses less digits than its factorization.

18499680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18499680 is about 4301.1254341161. The cubic root of 18499680 is about 264.4770987041.

The spelling of 18499680 in words is "eighteen million, four hundred ninety-nine thousand, six hundred eighty".