71864648 has 8 divisors (see below), whose sum is σ = 134746230. Its totient is φ = 35932320.

The previous prime is 71864647. The next prime is 71864651. The reversal of 71864648 is 84646817.

It can be written as a sum of positive squares in only one way, i.e., 66945124 + 4919524 = 8182^2 + 2218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 71864599 and 71864608.

It is not an unprimeable number, because it can be changed into a prime (71864647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4491533 + ... + 4491548.

Almost surely, 2^71864648 is an apocalyptic number.

It is an amenable number.

71864648 is a deficient number, since it is larger than the sum of its proper divisors (62881582).

71864648 is a wasteful number, since it uses less digits than its factorization.

71864648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983087 (or 8983083 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 71864648 is about 8477.3019292697. The cubic root of 71864648 is about 415.7559126533.

The spelling of 71864648 in words is "seventy-one million, eight hundred sixty-four thousand, six hundred forty-eight".