16978480 has 40 divisors (see below), whose sum is σ = 39966192. Its totient is φ = 6706944.

The previous prime is 16978459. The next prime is 16978487. The reversal of 16978480 is 8487961.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×16978480² = 576537566220800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16978487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5362 + ... + 7918.

Almost surely, 2^16978480 is an apocalyptic number.

16978480 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 16978480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19983096).

16978480 is an abundant number, since it is smaller than the sum of its proper divisors (22987712).

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

16978480 is a wasteful number, since it uses less digits than its factorization.

16978480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653 (or 2647 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 16978480 is about 4120.4951158811. The cubic root of 16978480 is about 257.0196152520.

The spelling of 16978480 in words is "sixteen million, nine hundred seventy-eight thousand, four hundred eighty".