7917428 has 24 divisors (see below), whose sum is σ = 14817600. Its totient is φ = 3692480.

The previous prime is 7917421. The next prime is 7917443. The reversal of 7917428 is 8247197.

7917428 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×7917428² = 125371332270368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7917391 and 7917400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7917421) 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, 2723 + ... + 4821.

It is an arithmetic number, because the mean of its divisors is an integer number (617400).

Almost surely, 2^7917428 is an apocalyptic number.

It is an amenable number.

7917428 is a deficient number, since it is larger than the sum of its proper divisors (6900172).

7917428 is a wasteful number, since it uses less digits than its factorization.

7917428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167 (or 2165 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 7917428 is about 2813.7924585868. The cubic root of 7917428 is about 199.3095189227.

The spelling of 7917428 in words is "seven million, nine hundred seventeen thousand, four hundred twenty-eight".