16278081 has 8 divisors (see below), whose sum is σ = 21826080. Its totient is φ = 10791072.

The previous prime is 16278047. The next prime is 16278083. The reversal of 16278081 is 18087261.

It is a happy number.

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

It is not a de Polignac number, because 16278081 - 2¹⁷ = 16147009 is a prime.

It is a super-2 number, since 2×16278081² = 529951842085122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16278083) 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, 14620 + ... + 15693.

It is an arithmetic number, because the mean of its divisors is an integer number (2728260).

Almost surely, 2^16278081 is an apocalyptic number.

It is an amenable number.

16278081 is a deficient number, since it is larger than the sum of its proper divisors (5547999).

16278081 is a wasteful number, since it uses less digits than its factorization.

16278081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30495.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 16278081 is about 4034.6103901120. The cubic root of 16278081 is about 253.4356671440.

The spelling of 16278081 in words is "sixteen million, two hundred seventy-eight thousand, eighty-one".