40120728 has 32 divisors (see below), whose sum is σ = 103014960. Its totient is φ = 13011840.

The previous prime is 40120721. The next prime is 40120733. The reversal of 40120728 is 82702104.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 40120698 and 40120707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40120721) 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, 21703 + ... + 23478.

Almost surely, 2^40120728 is an apocalyptic number.

It is an amenable number.

40120728 is an abundant number, since it is smaller than the sum of its proper divisors (62894232).

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

40120728 is a wasteful number, since it uses less digits than its factorization.

40120728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45227 (or 45223 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 40120728 is about 6334.0925159015. The cubic root of 40120728 is about 342.3389137174.

The spelling of 40120728 in words is "forty million, one hundred twenty thousand, seven hundred twenty-eight".