40047728 has 20 divisors (see below), whose sum is σ = 88677360. Its totient is φ = 17163264.

The previous prime is 40047697. The next prime is 40047731. The reversal of 40047728 is 82774004.

It is a junction number, because it is equal to n+sod(n) for n = 40047694 and 40047703.

It is a congruent number.

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, 178673 + ... + 178896.

It is an arithmetic number, because the mean of its divisors is an integer number (4433868).

Almost surely, 2^40047728 is an apocalyptic number.

It is an amenable number.

40047728 is an abundant number, since it is smaller than the sum of its proper divisors (48629632).

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

40047728 is a wasteful number, since it uses less digits than its factorization.

40047728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357584 (or 357578 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 40047728 is about 6328.3274251575. The cubic root of 40047728 is about 342.1311581570.

The spelling of 40047728 in words is "forty million, forty-seven thousand, seven hundred twenty-eight".