7904128 has 16 divisors (see below), whose sum is σ = 15746760. Its totient is φ = 3952000.

The previous prime is 7904123. The next prime is 7904161. The reversal of 7904128 is 8214097.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 7904128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7904123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30748 + ... + 31003.

Almost surely, 2^7904128 is an apocalyptic number.

It is an amenable number.

7904128 is a deficient number, since it is larger than the sum of its proper divisors (7842632).

7904128 is an equidigital number, since it uses as much as digits as its factorization.

7904128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61765 (or 61753 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 7904128 is about 2811.4281068525. The cubic root of 7904128 is about 199.1978537749.

Subtracting from 7904128 its sum of digits (31), we obtain a palindrome (7904097).

The spelling of 7904128 in words is "seven million, nine hundred four thousand, one hundred twenty-eight".