7928889 has 8 divisors (see below), whose sum is σ = 10607520. Its totient is φ = 5268096.

The previous prime is 7928881. The next prime is 7928897. The reversal of 7928889 is 9888297.

It is an interprime number because it is at equal distance from previous prime (7928881) and next prime (7928897).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7928889 - 2³ = 7928881 is a prime.

7928889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7928881) 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, 3384 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (1325940).

Almost surely, 2^7928889 is an apocalyptic number.

It is an amenable number.

7928889 is a deficient number, since it is larger than the sum of its proper divisors (2678631).

7928889 is a wasteful number, since it uses less digits than its factorization.

7928889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8919.

The product of its digits is 580608, while the sum is 51.

The square root of 7928889 is about 2815.8282973221. The cubic root of 7928889 is about 199.4056437865.

The spelling of 7928889 in words is "seven million, nine hundred twenty-eight thousand, eight hundred eighty-nine".