647337172 has 6 divisors (see below), whose sum is σ = 1132840058. Its totient is φ = 323668584.

The previous prime is 647337137. The next prime is 647337191. The reversal of 647337172 is 271733746.

It can be written as a sum of positive squares in only one way, i.e., 537590596 + 109746576 = 23186^2 + 10476^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80917143 + ... + 80917150.

Almost surely, 2^647337172 is an apocalyptic number.

It is an amenable number.

647337172 is a deficient number, since it is larger than the sum of its proper divisors (485502886).

647337172 is a wasteful number, since it uses less digits than its factorization.

647337172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161834297 (or 161834295 counting only the distinct ones).

The product of its digits is 148176, while the sum is 40.

The square root of 647337172 is about 25442.8216202527. The cubic root of 647337172 is about 865.0545910950.

The spelling of 647337172 in words is "six hundred forty-seven million, three hundred thirty-seven thousand, one hundred seventy-two".