642519136 has 48 divisors (see below), whose sum is σ = 1465509024. Its totient is φ = 271586304.

The previous prime is 642519133. The next prime is 642519151. The reversal of 642519136 is 631915246.

It is a junction number, because it is equal to n+sod(n) for n = 642519095 and 642519104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642519133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3295 + ... + 35998.

It is an arithmetic number, because the mean of its divisors is an integer number (30531438).

Almost surely, 2^642519136 is an apocalyptic number.

It is an amenable number.

642519136 is an abundant number, since it is smaller than the sum of its proper divisors (822989888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642519136 is a wasteful number, since it uses less digits than its factorization.

642519136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39383 (or 39375 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 642519136 is about 25347.9611803395. The cubic root of 642519136 is about 862.9030861400.

The spelling of 642519136 in words is "six hundred forty-two million, five hundred nineteen thousand, one hundred thirty-six".