642542750 has 32 divisors (see below), whose sum is σ = 1210876992. Its totient is φ = 255300000.

The previous prime is 642542717. The next prime is 642542759. The reversal of 642542750 is 57245246.

642542750 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×642542750² = 825722371155125000, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 642542750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642542759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29240 + ... + 46260.

It is an arithmetic number, because the mean of its divisors is an integer number (37839906).

Almost surely, 2^642542750 is an apocalyptic number.

642542750 is a deficient number, since it is larger than the sum of its proper divisors (568334242).

642542750 is a wasteful number, since it uses less digits than its factorization.

642542750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17189 (or 17179 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

The square root of 642542750 is about 25348.4269728912. The cubic root of 642542750 is about 862.9136572098.

Adding to 642542750 its reverse (57245246), we get a palindrome (699787996).

The spelling of 642542750 in words is "six hundred forty-two million, five hundred forty-two thousand, seven hundred fifty".