16780042 has 4 divisors (see below), whose sum is σ = 25170066. Its totient is φ = 8390020.

The previous prime is 16780031. The next prime is 16780051. The reversal of 16780042 is 24008761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 385641 = 4049^2 + 621^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4195009 + ... + 4195012.

Almost surely, 2^16780042 is an apocalyptic number.

16780042 is a deficient number, since it is larger than the sum of its proper divisors (8390024).

16780042 is an equidigital number, since it uses as much as digits as its factorization.

16780042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8390023.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 16780042 is about 4096.3449561774. The cubic root of 16780042 is about 256.0143729723.

The spelling of 16780042 in words is "sixteen million, seven hundred eighty thousand, forty-two".