47664647 has 4 divisors (see below), whose sum is σ = 47685960. Its totient is φ = 47643336.

The previous prime is 47664641. The next prime is 47664677. The reversal of 47664647 is 74646674.

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-47664647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47664598 and 47664607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47664641) 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, 6848 + ... + 11925.

It is an arithmetic number, because the mean of its divisors is an integer number (11921490).

Almost surely, 2^47664647 is an apocalyptic number.

47664647 is a deficient number, since it is larger than the sum of its proper divisors (21313).

47664647 is a wasteful number, since it uses less digits than its factorization.

47664647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21312.

The product of its digits is 677376, while the sum is 44.

The square root of 47664647 is about 6903.9587918817. The cubic root of 47664647 is about 362.5757831254.

The spelling of 47664647 in words is "forty-seven million, six hundred sixty-four thousand, six hundred forty-seven".