428653649 has 4 divisors (see below), whose sum is σ = 435680820. Its totient is φ = 421626480.

The previous prime is 428653639. The next prime is 428653681. The reversal of 428653649 is 946356824.

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 110923024 + 317730625 = 10532^2 + 17825^2 .

It is a cyclic number.

It is not a de Polignac number, because 428653649 - 2⁴ = 428653633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (428653609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3513494 + ... + 3513615.

It is an arithmetic number, because the mean of its divisors is an integer number (108920205).

Almost surely, 2^428653649 is an apocalyptic number.

It is an amenable number.

428653649 is a deficient number, since it is larger than the sum of its proper divisors (7027171).

428653649 is an equidigital number, since it uses as much as digits as its factorization.

428653649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027170.

The product of its digits is 1244160, while the sum is 47.

The square root of 428653649 is about 20703.9524970475. The cubic root of 428653649 is about 753.9956523987.

The spelling of 428653649 in words is "four hundred twenty-eight million, six hundred fifty-three thousand, six hundred forty-nine".