40782728 has 32 divisors (see below), whose sum is σ = 92534400. Its totient is φ = 16449792.

The previous prime is 40782727. The next prime is 40782761. The reversal of 40782728 is 82728704.

It is a junction number, because it is equal to n+sod(n) for n = 40782691 and 40782700.

It is not an unprimeable number, because it can be changed into a prime (40782727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20468 + ... + 22371.

It is an arithmetic number, because the mean of its divisors is an integer number (2891700).

Almost surely, 2^40782728 is an apocalyptic number.

It is an amenable number.

40782728 is an abundant number, since it is smaller than the sum of its proper divisors (51751672).

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

40782728 is a wasteful number, since it uses less digits than its factorization.

40782728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42869 (or 42865 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 40782728 is about 6386.1356077052. The cubic root of 40782728 is about 344.2115383600.

The spelling of 40782728 in words is "forty million, seven hundred eighty-two thousand, seven hundred twenty-eight".