16978645 has 8 divisors (see below), whose sum is σ = 20437920. Its totient is φ = 13540560.

The previous prime is 16978639. The next prime is 16978649. The reversal of 16978645 is 54687961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16978645 - 2⁵ = 16978613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16978595 and 16978604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16978649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3475 + ... + 6784.

It is an arithmetic number, because the mean of its divisors is an integer number (2554740).

Almost surely, 2^16978645 is an apocalyptic number.

It is an amenable number.

16978645 is a deficient number, since it is larger than the sum of its proper divisors (3459275).

16978645 is a wasteful number, since it uses less digits than its factorization.

16978645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10595.

The product of its digits is 362880, while the sum is 46.

The square root of 16978645 is about 4120.5151376982. The cubic root of 16978645 is about 257.0204478373.

The spelling of 16978645 in words is "sixteen million, nine hundred seventy-eight thousand, six hundred forty-five".