47661646 has 4 divisors (see below), whose sum is σ = 71492472. Its totient is φ = 23830822.

The previous prime is 47661643. The next prime is 47661701. The reversal of 47661646 is 64616674.

It is a happy number.

47661646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 47661599 and 47661608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47661643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11915410 + ... + 11915413.

It is an arithmetic number, because the mean of its divisors is an integer number (17873118).

Almost surely, 2^47661646 is an apocalyptic number.

47661646 is a deficient number, since it is larger than the sum of its proper divisors (23830826).

47661646 is a wasteful number, since it uses less digits than its factorization.

47661646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23830825.

The product of its digits is 145152, while the sum is 40.

The square root of 47661646 is about 6903.7414493882. The cubic root of 47661646 is about 362.5681736228.

The spelling of 47661646 in words is "forty-seven million, six hundred sixty-one thousand, six hundred forty-six".