40812728 has 16 divisors (see below), whose sum is σ = 83480760. Its totient is φ = 18551200.

The previous prime is 40812727. The next prime is 40812781. The reversal of 40812728 is 82721804.

It is a super-3 number, since 3×40812728³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40812694 and 40812703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40812727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231803 + ... + 231978.

Almost surely, 2^40812728 is an apocalyptic number.

It is an amenable number.

40812728 is an abundant number, since it is smaller than the sum of its proper divisors (42668032).

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

40812728 is a wasteful number, since it uses less digits than its factorization.

40812728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463798 (or 463794 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 40812728 is about 6388.4840142243. The cubic root of 40812728 is about 344.2959189761.

The spelling of 40812728 in words is "forty million, eight hundred twelve thousand, seven hundred twenty-eight".