647832091 has 8 divisors (see below), whose sum is σ = 660783744. Its totient is φ = 634907520.

The previous prime is 647832077. The next prime is 647832137. The reversal of 647832091 is 190238746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647832091 - 2¹⁹ = 647307803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647832011) 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, 45526 + ... + 58036.

It is an arithmetic number, because the mean of its divisors is an integer number (82597968).

Almost surely, 2^647832091 is an apocalyptic number.

647832091 is a deficient number, since it is larger than the sum of its proper divisors (12951653).

647832091 is a wasteful number, since it uses less digits than its factorization.

647832091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13541.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 647832091 is about 25452.5458648050. The cubic root of 647832091 is about 865.2749929243.

The spelling of 647832091 in words is "six hundred forty-seven million, eight hundred thirty-two thousand, ninety-one".