642487336 has 32 divisors (see below), whose sum is σ = 1259294400. Its totient is φ = 306725760.

The previous prime is 642487331. The next prime is 642487379. The reversal of 642487336 is 633784246.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 642487292 and 642487301.

It is not an unprimeable number, because it can be changed into a prime (642487331) 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, 111076 + ... + 116716.

It is an arithmetic number, because the mean of its divisors is an integer number (39352950).

Almost surely, 2^642487336 is an apocalyptic number.

It is an amenable number.

642487336 is a deficient number, since it is larger than the sum of its proper divisors (616807064).

642487336 is a wasteful number, since it uses less digits than its factorization.

642487336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289 (or 6285 counting only the distinct ones).

The product of its digits is 580608, while the sum is 43.

The square root of 642487336 is about 25347.3339031938. Note that the first 3 decimals coincide. The cubic root of 642487336 is about 862.8888501070. Note that the first 4 decimals are identical.

The spelling of 642487336 in words is "six hundred forty-two million, four hundred eighty-seven thousand, three hundred thirty-six".