642209975 has 36 divisors (see below), whose sum is σ = 917006040. Its totient is φ = 442411200.

The previous prime is 642209951. The next prime is 642209987. The reversal of 642209975 is 579902246.

It is not a de Polignac number, because 642209975 - 2¹⁰ = 642208951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 96041 + ... + 102509.

It is an arithmetic number, because the mean of its divisors is an integer number (25472390).

Almost surely, 2^642209975 is an apocalyptic number.

642209975 is a deficient number, since it is larger than the sum of its proper divisors (274796065).

642209975 is a wasteful number, since it uses less digits than its factorization.

642209975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6528 (or 6504 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 642209975 is about 25341.8621060095. The cubic root of 642209975 is about 862.7646628798.

Adding to 642209975 its reverse (579902246), we get a palindrome (1222112221).

The spelling of 642209975 in words is "six hundred forty-two million, two hundred nine thousand, nine hundred seventy-five".