7928040 has 32 divisors (see below), whose sum is σ = 23784480. Its totient is φ = 2114112.

The previous prime is 7928023. The next prime is 7928059. The reversal of 7928040 is 408297.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7927989 and 7928007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32914 + ... + 33153.

It is an arithmetic number, because the mean of its divisors is an integer number (743265).

Almost surely, 2^7928040 is an apocalyptic number.

It is an amenable number.

7928040 is an abundant number, since it is smaller than the sum of its proper divisors (15856440).

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

7928040 is a wasteful number, since it uses less digits than its factorization.

7928040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66081 (or 66077 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 7928040 is about 2815.6775383556. The cubic root of 7928040 is about 199.3985262935.

The spelling of 7928040 in words is "seven million, nine hundred twenty-eight thousand, forty".