16533540 has 72 divisors (see below), whose sum is σ = 51787008. Its totient is φ = 4265280.

The previous prime is 16533529. The next prime is 16533541. The reversal of 16533540 is 4533561.

16533540 is a `hidden beast` number, since 1 + 653 + 3 + 5 + 4 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (16533541) 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, 4099 + ... + 7061.

It is an arithmetic number, because the mean of its divisors is an integer number (719264).

Almost surely, 2^16533540 is an apocalyptic number.

16533540 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 16533540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25893504).

16533540 is an abundant number, since it is smaller than the sum of its proper divisors (35253468).

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

16533540 is a wasteful number, since it uses less digits than its factorization.

16533540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009 (or 3004 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 16533540 is about 4066.1455950322. The cubic root of 16533540 is about 254.7545504395.

The spelling of 16533540 in words is "sixteen million, five hundred thirty-three thousand, five hundred forty".