16081578 has 40 divisors (see below), whose sum is σ = 36734148. Its totient is φ = 5256576.

The previous prime is 16081547. The next prime is 16081579. The reversal of 16081578 is 87518061.

16081578 is a `hidden beast` number, since 1 + 6 + 0 + 81 + 578 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15468489 + 613089 = 3933^2 + 783^2 .

It is not an unprimeable number, because it can be changed into a prime (16081579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7650 + ... + 9522.

Almost surely, 2^16081578 is an apocalyptic number.

16081578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16081578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18367074).

16081578 is an abundant number, since it is smaller than the sum of its proper divisors (20652570).

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

16081578 is a wasteful number, since it uses less digits than its factorization.

16081578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 16081578 is about 4010.1842850423. The cubic root of 16081578 is about 252.4117418561.

The spelling of 16081578 in words is "sixteen million, eighty-one thousand, five hundred seventy-eight".