40656728 has 16 divisors (see below), whose sum is σ = 87121680. Its totient is φ = 17424288.

The previous prime is 40656727. The next prime is 40656731. The reversal of 40656728 is 82765604.

40656728 = 2407² + 2408² + ... + 2413².

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 40656691 and 40656700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40656727) 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, 362951 + ... + 363062.

It is an arithmetic number, because the mean of its divisors is an integer number (5445105).

Almost surely, 2^40656728 is an apocalyptic number.

It is an amenable number.

40656728 is an abundant number, since it is smaller than the sum of its proper divisors (46464952).

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

40656728 is a wasteful number, since it uses less digits than its factorization.

40656728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726026 (or 726022 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 40656728 is about 6376.2628553095. The cubic root of 40656728 is about 343.8566871934.

It can be divided in two parts, 406567 and 28, that multiplied together give a square (11383876 = 3374²).

The spelling of 40656728 in words is "forty million, six hundred fifty-six thousand, seven hundred twenty-eight".