647439883 has 4 divisors (see below), whose sum is σ = 685524600. Its totient is φ = 609355168.

The previous prime is 647439869. The next prime is 647439893. The reversal of 647439883 is 388934746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647439883 - 2¹³ = 647431691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647439883.

It is not an unprimeable number, because it can be changed into a prime (647439823) 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, 19042333 + ... + 19042366.

It is an arithmetic number, because the mean of its divisors is an integer number (171381150).

Almost surely, 2^647439883 is an apocalyptic number.

647439883 is a deficient number, since it is larger than the sum of its proper divisors (38084717).

647439883 is a wasteful number, since it uses less digits than its factorization.

647439883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38084716.

The product of its digits is 3483648, while the sum is 52.

The square root of 647439883 is about 25444.8400073571. The cubic root of 647439883 is about 865.1003405268.

The spelling of 647439883 in words is "six hundred forty-seven million, four hundred thirty-nine thousand, eight hundred eighty-three".