16081780 has 48 divisors (see below), whose sum is σ = 39682944. Its totient is φ = 5397120.

The previous prime is 16081759. The next prime is 16081781. The reversal of 16081780 is 8718061.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16081781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49 + ... + 5671.

It is an arithmetic number, because the mean of its divisors is an integer number (826728).

Almost surely, 2^16081780 is an apocalyptic number.

16081780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16081780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19841472).

16081780 is an abundant number, since it is smaller than the sum of its proper divisors (23601164).

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

16081780 is a wasteful number, since it uses less digits than its factorization.

16081780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5656 (or 5654 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 16081780 is about 4010.2094708382. The cubic root of 16081780 is about 252.4127986960.

It can be divided in two parts, 16081 and 780, that added together give a palindrome (16861).

The spelling of 16081780 in words is "sixteen million, eighty-one thousand, seven hundred eighty".