82681621 has 8 divisors (see below), whose sum is σ = 90302688. Its totient is φ = 75078000.

The previous prime is 82681609. The next prime is 82681633. The reversal of 82681621 is 12618628.

It is an interprime number because it is at equal distance from previous prime (82681609) and next prime (82681633).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82681621 - 2⁵ = 82681589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82681691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6811 + ... + 14551.

It is an arithmetic number, because the mean of its divisors is an integer number (11287836).

Almost surely, 2^82681621 is an apocalyptic number.

It is an amenable number.

82681621 is a deficient number, since it is larger than the sum of its proper divisors (7621067).

82681621 is a wasteful number, since it uses less digits than its factorization.

82681621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8723.

The product of its digits is 9216, while the sum is 34.

The square root of 82681621 is about 9092.9434728255. The cubic root of 82681621 is about 435.6486047986.

It can be divided in two parts, 8268 and 1621, that added together give a palindrome (9889).

The spelling of 82681621 in words is "eighty-two million, six hundred eighty-one thousand, six hundred twenty-one".