647571889 has 4 divisors (see below), whose sum is σ = 681654640. Its totient is φ = 613489140.

The previous prime is 647571887. The next prime is 647571919. The reversal of 647571889 is 988175746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988175746 = 2 ⋅494087873.

It is a cyclic number.

It is not a de Polignac number, because 647571889 - 2¹ = 647571887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647571887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17041347 + ... + 17041384.

It is an arithmetic number, because the mean of its divisors is an integer number (170413660).

Almost surely, 2^647571889 is an apocalyptic number.

It is an amenable number.

647571889 is a deficient number, since it is larger than the sum of its proper divisors (34082751).

647571889 is a wasteful number, since it uses less digits than its factorization.

647571889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34082750.

The product of its digits is 3386880, while the sum is 55.

The square root of 647571889 is about 25447.4338391909. The cubic root of 647571889 is about 865.1591314036.

The spelling of 647571889 in words is "six hundred forty-seven million, five hundred seventy-one thousand, eight hundred eighty-nine".