82025721 has 12 divisors (see below), whose sum is σ = 122304000. Its totient is φ = 52919640.

The previous prime is 82025711. The next prime is 82025737. The reversal of 82025721 is 12752028.

It is not a de Polignac number, because 82025721 - 2¹⁴ = 82009337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82025711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146721 + ... + 147278.

It is an arithmetic number, because the mean of its divisors is an integer number (10192000).

Almost surely, 2^82025721 is an apocalyptic number.

It is an amenable number.

82025721 is a deficient number, since it is larger than the sum of its proper divisors (40278279).

82025721 is a wasteful number, since it uses less digits than its factorization.

82025721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294036 (or 294033 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 82025721 is about 9056.8052314268. The cubic root of 82025721 is about 434.4935683845.

Adding to 82025721 its reverse (12752028), we get a palindrome (94777749).

The spelling of 82025721 in words is "eighty-two million, twenty-five thousand, seven hundred twenty-one".