642630542 has 16 divisors (see below), whose sum is σ = 969080112. Its totient is φ = 319608960.

The previous prime is 642630533. The next prime is 642630601. The reversal of 642630542 is 245036246.

642630542 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 2×642630542² = 825948027022427528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642630499 and 642630508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391748 + ... + 393384.

It is an arithmetic number, because the mean of its divisors is an integer number (60567507).

Almost surely, 2^642630542 is an apocalyptic number.

642630542 is a deficient number, since it is larger than the sum of its proper divisors (326449570).

642630542 is a wasteful number, since it uses less digits than its factorization.

642630542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 642630542 is about 25350.1586188331. The cubic root of 642630542 is about 862.9529560039.

Adding to 642630542 its reverse (245036246), we get a palindrome (887666788).

The spelling of 642630542 in words is "six hundred forty-two million, six hundred thirty thousand, five hundred forty-two".