16890087890 has 32 divisors (see below), whose sum is σ = 32798470320. Its totient is φ = 6225352704.

The previous prime is 16890087871. The next prime is 16890087913. The reversal of 16890087890 is 9878009861.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1803615961 + 15086471929 = 42469^2 + 122827^2 .

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40199 + ... + 188138.

Almost surely, 2^16890087890 is an apocalyptic number.

16890087890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16890087890 is a deficient number, since it is larger than the sum of its proper divisors (15908382430).

16890087890 is a wasteful number, since it uses less digits than its factorization.

16890087890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228926.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The spelling of 16890087890 in words is "sixteen billion, eight hundred ninety million, eighty-seven thousand, eight hundred ninety".