647642136 has 32 divisors (see below), whose sum is σ = 1620567360. Its totient is φ = 215685792.

The previous prime is 647642101. The next prime is 647642137. The reversal of 647642136 is 631246746.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 647642094 and 647642103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647642137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16311 + ... + 39513.

It is an arithmetic number, because the mean of its divisors is an integer number (50642730).

Almost surely, 2^647642136 is an apocalyptic number.

It is an amenable number.

647642136 is an abundant number, since it is smaller than the sum of its proper divisors (972925224).

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

647642136 is a wasteful number, since it uses less digits than its factorization.

647642136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24375 (or 24371 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 647642136 is about 25448.8140391650. The cubic root of 647642136 is about 865.1904137148.

The spelling of 647642136 in words is "six hundred forty-seven million, six hundred forty-two thousand, one hundred thirty-six".