16776081 has 36 divisors (see below), whose sum is σ = 28528500. Its totient is φ = 9471168.

The previous prime is 16776079. The next prime is 16776083. The reversal of 16776081 is 18067761.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16776079) and next prime (16776083).

It can be written as a sum of positive squares in 2 ways, for example, as 12006225 + 4769856 = 3465^2 + 2184^2 .

It is not a de Polignac number, because 16776081 - 2¹ = 16776079 is a prime.

It is a super-2 number, since 2×16776081² = 562873787437122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16776083) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 47895 + ... + 48243.

Almost surely, 2^16776081 is an apocalyptic number.

It is an amenable number.

16776081 is a deficient number, since it is larger than the sum of its proper divisors (11752419).

16776081 is a wasteful number, since it uses less digits than its factorization.

16776081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 16776081 is about 4095.8614478520. The cubic root of 16776081 is about 255.9942269613.

The spelling of 16776081 in words is "sixteen million, seven hundred seventy-six thousand, eighty-one".