647138040 has 32 divisors (see below), whose sum is σ = 1941414480. Its totient is φ = 172570112.

The previous prime is 647138027. The next prime is 647138047. The reversal of 647138040 is 40831746.

It is a junction number, because it is equal to n+sod(n) for n = 647137992 and 647138010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647138047) 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, 2696289 + ... + 2696528.

Almost surely, 2^647138040 is an apocalyptic number.

647138040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647138040 is an abundant number, since it is smaller than the sum of its proper divisors (1294276440).

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

647138040 is a wasteful number, since it uses less digits than its factorization.

647138040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392831 (or 5392827 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 647138040 is about 25438.9079954309. The cubic root of 647138040 is about 864.9658801292.

Adding to 647138040 its reverse (40831746), we get a palindrome (687969786).

The spelling of 647138040 in words is "six hundred forty-seven million, one hundred thirty-eight thousand, forty".