43545816 has 48 divisors (see below), whose sum is σ = 121230600. Its totient is φ = 14482944.

The previous prime is 43545811. The next prime is 43545851. The reversal of 43545816 is 61854534.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a super-2 number, since 2×43545816² = 3792476182211712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43545811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96760 + ... + 97208.

Almost surely, 2^43545816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43545816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60615300).

43545816 is an abundant number, since it is smaller than the sum of its proper divisors (77684784).

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

43545816 is an equidigital number, since it uses as much as digits as its factorization.

43545816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 454 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 43545816 is about 6598.9253670579. The cubic root of 43545816 is about 351.8159118351.

The spelling of 43545816 in words is "forty-three million, five hundred forty-five thousand, eight hundred sixteen".