7428665 has 4 divisors (see below), whose sum is σ = 8914404. Its totient is φ = 5942928.

The previous prime is 7428653. The next prime is 7428671. The reversal of 7428665 is 5668247.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5707321 + 1721344 = 2389^2 + 1312^2 .

It is a cyclic number.

It is not a de Polignac number, because 7428665 - 2⁴ = 7428649 is a prime.

It is a super-4 number, since 4×7428665⁴ (a number of 29 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742862 + ... + 742871.

It is an arithmetic number, because the mean of its divisors is an integer number (2228601).

Almost surely, 2^7428665 is an apocalyptic number.

It is an amenable number.

7428665 is a deficient number, since it is larger than the sum of its proper divisors (1485739).

7428665 is a wasteful number, since it uses less digits than its factorization.

7428665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485738.

The product of its digits is 80640, while the sum is 38.

The square root of 7428665 is about 2725.5577410871. The cubic root of 7428665 is about 195.1208105199.

The spelling of 7428665 in words is "seven million, four hundred twenty-eight thousand, six hundred sixty-five".