642053630 has 16 divisors (see below), whose sum is σ = 1172946960. Its totient is φ = 252988032.

The previous prime is 642053627. The next prime is 642053641. The reversal of 642053630 is 36350246.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642053593 and 642053602.

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, 478475 + ... + 479814.

It is an arithmetic number, because the mean of its divisors is an integer number (73309185).

Almost surely, 2^642053630 is an apocalyptic number.

642053630 is a deficient number, since it is larger than the sum of its proper divisors (530893330).

642053630 is a wasteful number, since it uses less digits than its factorization.

642053630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958363.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 642053630 is about 25338.7772001729. Note that the first 3 decimals coincide. The cubic root of 642053630 is about 862.6946443012.

The spelling of 642053630 in words is "six hundred forty-two million, fifty-three thousand, six hundred thirty".