16878481 has 4 divisors (see below), whose sum is σ = 17612352. Its totient is φ = 16144612.

The previous prime is 16878473. The next prime is 16878497. The reversal of 16878481 is 18487861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18487861 = 7 ⋅2641123.

It is a cyclic number.

It is not a de Polignac number, because 16878481 - 2³ = 16878473 is a prime.

It is a super-2 number, since 2×16878481² = 569766241734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16878451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366901 + ... + 366946.

It is an arithmetic number, because the mean of its divisors is an integer number (4403088).

Almost surely, 2^16878481 is an apocalyptic number.

It is an amenable number.

16878481 is a deficient number, since it is larger than the sum of its proper divisors (733871).

16878481 is an equidigital number, since it uses as much as digits as its factorization.

16878481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733870.

The product of its digits is 86016, while the sum is 43.

The square root of 16878481 is about 4108.3428532682. The cubic root of 16878481 is about 256.5140276075.

The spelling of 16878481 in words is "sixteen million, eight hundred seventy-eight thousand, four hundred eighty-one".