1635225428 has 6 divisors (see below), whose sum is σ = 2861644506. Its totient is φ = 817612712.

The previous prime is 1635225421. The next prime is 1635225433. The reversal of 1635225428 is 8245225361.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1008824644 + 626400784 = 31762^2 + 25028^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1635225391 and 1635225400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1635225421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204403175 + ... + 204403182.

It is an arithmetic number, because the mean of its divisors is an integer number (476940751).

Almost surely, 2^1635225428 is an apocalyptic number.

It is an amenable number.

1635225428 is a deficient number, since it is larger than the sum of its proper divisors (1226419078).

1635225428 is a wasteful number, since it uses less digits than its factorization.

1635225428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408806361 (or 408806359 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The square root of 1635225428 is about 40437.9206686002. The cubic root of 1635225428 is about 1178.1281795025.

The spelling of 1635225428 in words is "one billion, six hundred thirty-five million, two hundred twenty-five thousand, four hundred twenty-eight".