642635049 has 24 divisors (see below), whose sum is σ = 1000768608. Its totient is φ = 365736000.

The previous prime is 642635033. The next prime is 642635051. The reversal of 642635049 is 940536246.

642635049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642635049 - 2⁴ = 642635033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642634998 and 642635016.

It is not an unprimeable number, because it can be changed into a prime (642635449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28189 + ... + 45605.

It is an arithmetic number, because the mean of its divisors is an integer number (41698692).

Almost surely, 2^642635049 is an apocalyptic number.

It is an amenable number.

642635049 is a deficient number, since it is larger than the sum of its proper divisors (358133559).

642635049 is a wasteful number, since it uses less digits than its factorization.

642635049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17685 (or 17678 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 642635049 is about 25350.2475135846. The cubic root of 642635049 is about 862.9549733994.

The spelling of 642635049 in words is "six hundred forty-two million, six hundred thirty-five thousand, forty-nine".