7820128 has 12 divisors (see below), whose sum is σ = 15395940. Its totient is φ = 3910048.

The previous prime is 7820123. The next prime is 7820143. The reversal of 7820128 is 8210287.

It is a super-2 number, since 2×7820128² = 122308803872768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7820096 and 7820105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7820123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122158 + ... + 122221.

It is an arithmetic number, because the mean of its divisors is an integer number (1282995).

Almost surely, 2^7820128 is an apocalyptic number.

It is an amenable number.

7820128 is a deficient number, since it is larger than the sum of its proper divisors (7575812).

7820128 is a wasteful number, since it uses less digits than its factorization.

7820128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244389 (or 244381 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 7820128 is about 2796.4491770815. The cubic root of 7820128 is about 198.4896901971.

The spelling of 7820128 in words is "seven million, eight hundred twenty thousand, one hundred twenty-eight".