7428649 has 2 divisors, whose sum is σ = 7428650. Its totient is φ = 7428648.

The previous prime is 7428599. The next prime is 7428653. The reversal of 7428649 is 9468247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7252249 + 176400 = 2693^2 + 420^2 .

It is an emirp because it is prime and its reverse (9468247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7428649 - 2⁷ = 7428521 is a prime.

It is a super-3 number, since 3×7428649³ (a number of 22 digits) contains 333 as substring.

7428649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7428049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3714324 + 3714325.

It is an arithmetic number, because the mean of its divisors is an integer number (3714325).

Almost surely, 2^7428649 is an apocalyptic number.

It is an amenable number.

7428649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7428649 is an equidigital number, since it uses as much as digits as its factorization.

7428649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 7428649 is about 2725.5548059065. The cubic root of 7428649 is about 195.1206704348.

The spelling of 7428649 in words is "seven million, four hundred twenty-eight thousand, six hundred forty-nine".