635421802 has 4 divisors (see below), whose sum is σ = 953132706. Its totient is φ = 317710900.

The previous prime is 635421797. The next prime is 635421803. The reversal of 635421802 is 208124536.

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

It can be written as a sum of positive squares in only one way, i.e., 423166041 + 212255761 = 20571^2 + 14569^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (635421803) 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, 158855449 + ... + 158855452.

Almost surely, 2^635421802 is an apocalyptic number.

635421802 is a deficient number, since it is larger than the sum of its proper divisors (317710904).

635421802 is a wasteful number, since it uses less digits than its factorization.

635421802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317710903.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 635421802 is about 25207.5742982144. The cubic root of 635421802 is about 859.7140756721.

The spelling of 635421802 in words is "six hundred thirty-five million, four hundred twenty-one thousand, eight hundred two".