71821825 has 24 divisors (see below), whose sum is σ = 92511936. Its totient is φ = 55272000.

The previous prime is 71821819. The next prime is 71821829. The reversal of 71821825 is 52812817.

It is not a de Polignac number, because 71821825 - 2⁷ = 71821697 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71821829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75855 + ... + 76795.

It is an arithmetic number, because the mean of its divisors is an integer number (3854664).

Almost surely, 2^71821825 is an apocalyptic number.

It is an amenable number.

71821825 is a deficient number, since it is larger than the sum of its proper divisors (20690111).

71821825 is a wasteful number, since it uses less digits than its factorization.

71821825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1060 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 71821825 is about 8474.7758082441. The cubic root of 71821825 is about 415.6733154679.

The spelling of 71821825 in words is "seventy-one million, eight hundred twenty-one thousand, eight hundred twenty-five".