4004040728 has 8 divisors (see below), whose sum is σ = 7507576380. Its totient is φ = 2002020360.

The previous prime is 4004040727. The next prime is 4004040737. The reversal of 4004040728 is 8270404004.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 4004040728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4004040727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250252538 + ... + 250252553.

Almost surely, 2^4004040728 is an apocalyptic number.

It is an amenable number.

4004040728 is a deficient number, since it is larger than the sum of its proper divisors (3503535652).

4004040728 is a wasteful number, since it uses less digits than its factorization.

4004040728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500505097 (or 500505093 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 4004040728 is about 63277.4898996476. The cubic root of 4004040728 is about 1587.9353934044.

The spelling of 4004040728 in words is "four billion, four million, forty thousand, seven hundred twenty-eight".