647734747 has 4 divisors (see below), whose sum is σ = 706619736. Its totient is φ = 588849760.

The previous prime is 647734733. The next prime is 647734781. The reversal of 647734747 is 747437746.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647734747 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 647734747.

It is not an unprimeable number, because it can be changed into a prime (647714747) 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, 29442478 + ... + 29442499.

It is an arithmetic number, because the mean of its divisors is an integer number (176654934).

Almost surely, 2^647734747 is an apocalyptic number.

647734747 is a deficient number, since it is larger than the sum of its proper divisors (58884989).

647734747 is a wasteful number, since it uses less digits than its factorization.

647734747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58884988.

The product of its digits is 2765952, while the sum is 49.

The square root of 647734747 is about 25450.6335284605. The cubic root of 647734747 is about 865.2316516794.

The spelling of 647734747 in words is "six hundred forty-seven million, seven hundred thirty-four thousand, seven hundred forty-seven".