18687480 has 64 divisors (see below), whose sum is σ = 64074240. Its totient is φ = 4271232.

The previous prime is 18687463. The next prime is 18687481. The reversal of 18687480 is 8478681.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18687481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10284 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (1001160).

Almost surely, 2^18687480 is an apocalyptic number.

18687480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18687480 is an abundant number, since it is smaller than the sum of its proper divisors (45386760).

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

18687480 is a wasteful number, since it uses less digits than its factorization.

18687480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22268 (or 22264 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 18687480 is about 4322.9018031873. The cubic root of 18687480 is about 265.3690361009.

The spelling of 18687480 in words is "eighteen million, six hundred eighty-seven thousand, four hundred eighty".