47720164 has 6 divisors (see below), whose sum is σ = 83510294. Its totient is φ = 23860080.

The previous prime is 47720161. The next prime is 47720171. The reversal of 47720164 is 46102774.

It can be written as a sum of positive squares in only one way, i.e., 38539264 + 9180900 = 6208^2 + 3030^2 .

It is not an unprimeable number, because it can be changed into a prime (47720161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5965017 + ... + 5965024.

Almost surely, 2^47720164 is an apocalyptic number.

It is an amenable number.

47720164 is a deficient number, since it is larger than the sum of its proper divisors (35790130).

47720164 is a wasteful number, since it uses less digits than its factorization.

47720164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11930045 (or 11930043 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 47720164 is about 6907.9782860110. The cubic root of 47720164 is about 362.7164975472.

The spelling of 47720164 in words is "forty-seven million, seven hundred twenty thousand, one hundred sixty-four".