40818728 has 16 divisors (see below), whose sum is σ = 76934580. Its totient is φ = 20302848.

The previous prime is 40818719. The next prime is 40818761. The reversal of 40818728 is 82781804.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40729924 + 88804 = 6382^2 + 298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40818691 and 40818700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11675 + ... + 14762.

Almost surely, 2^40818728 is an apocalyptic number.

It is an amenable number.

40818728 is a deficient number, since it is larger than the sum of its proper divisors (36115852).

40818728 is a wasteful number, since it uses less digits than its factorization.

40818728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26636 (or 26632 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 40818728 is about 6388.9535919429. The cubic root of 40818728 is about 344.3127901369.

The spelling of 40818728 in words is "forty million, eight hundred eighteen thousand, seven hundred twenty-eight".