635742506 has 16 divisors (see below), whose sum is σ = 1153953216. Its totient is φ = 256433856.

The previous prime is 635742491. The next prime is 635742509. The reversal of 635742506 is 605247536.

It is a self number, because there is not a number n which added to its sum of digits gives 635742506.

It is not an unprimeable number, because it can be changed into a prime (635742509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1335356 + ... + 1335831.

It is an arithmetic number, because the mean of its divisors is an integer number (72122076).

Almost surely, 2^635742506 is an apocalyptic number.

635742506 is a deficient number, since it is larger than the sum of its proper divisors (518210710).

635742506 is a wasteful number, since it uses less digits than its factorization.

635742506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671213.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 635742506 is about 25213.9347583831. The cubic root of 635742506 is about 859.8586868946.

The spelling of 635742506 in words is "six hundred thirty-five million, seven hundred forty-two thousand, five hundred six".