40728040 has 16 divisors (see below), whose sum is σ = 91638180. Its totient is φ = 16291200.

The previous prime is 40728029. The next prime is 40728041. The reversal of 40728040 is 4082704.

It can be written as a sum of positive squares in 2 ways, for example, as 35354916 + 5373124 = 5946^2 + 2318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40727996 and 40728014.

It is not an unprimeable number, because it can be changed into a prime (40728041) 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, 509061 + ... + 509140.

Almost surely, 2^40728040 is an apocalyptic number.

40728040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40728040 is an abundant number, since it is smaller than the sum of its proper divisors (50910140).

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

40728040 is a wasteful number, since it uses less digits than its factorization.

40728040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018212 (or 1018208 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 40728040 is about 6381.8523956607. The cubic root of 40728040 is about 344.0576115876.

The spelling of 40728040 in words is "forty million, seven hundred twenty-eight thousand, forty".