16780038 has 48 divisors (see below), whose sum is σ = 38208240. Its totient is φ = 4903360.

The previous prime is 16780031. The next prime is 16780051. The reversal of 16780038 is 83008761.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 16779990 and 16780008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16780031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20656 + ... + 21452.

It is an arithmetic number, because the mean of its divisors is an integer number (796005).

Almost surely, 2^16780038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16780038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19104120).

16780038 is an abundant number, since it is smaller than the sum of its proper divisors (21428202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16780038 is a wasteful number, since it uses less digits than its factorization.

16780038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 16780038 is about 4096.3444679372. The cubic root of 16780038 is about 256.0143526296.

Adding to 16780038 its reverse (83008761), we get a palindrome (99788799).

The spelling of 16780038 in words is "sixteen million, seven hundred eighty thousand, thirty-eight".