634428505 has 32 divisors (see below), whose sum is σ = 803325600. Its totient is φ = 480356352.

The previous prime is 634428499. The next prime is 634428581. The reversal of 634428505 is 505824436.

It can be written as a sum of positive squares in 16 ways, for example, as 597529 + 633830976 = 773^2 + 25176^2 .

It is a cyclic number.

It is not a de Polignac number, because 634428505 - 2¹⁹ = 633904217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2165139 + ... + 2165431.

It is an arithmetic number, because the mean of its divisors is an integer number (25103925).

Almost surely, 2^634428505 is an apocalyptic number.

It is an amenable number.

634428505 is a deficient number, since it is larger than the sum of its proper divisors (168897095).

634428505 is a wasteful number, since it uses less digits than its factorization.

634428505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 634428505 is about 25187.8642405425. The cubic root of 634428505 is about 859.2658711543.

The spelling of 634428505 in words is "six hundred thirty-four million, four hundred twenty-eight thousand, five hundred five".