82769721 has 8 divisors (see below), whose sum is σ = 113919744. Its totient is φ = 53399760.

The previous prime is 82769717. The next prime is 82769749. The reversal of 82769721 is 12796728.

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

It is not a de Polignac number, because 82769721 - 2² = 82769717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82769761) 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, 444906 + ... + 445091.

It is an arithmetic number, because the mean of its divisors is an integer number (14239968).

Almost surely, 2^82769721 is an apocalyptic number.

It is an amenable number.

82769721 is a deficient number, since it is larger than the sum of its proper divisors (31150023).

82769721 is a wasteful number, since it uses less digits than its factorization.

82769721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890031.

The product of its digits is 84672, while the sum is 42.

The square root of 82769721 is about 9097.7865989481. The cubic root of 82769721 is about 435.8032825361.

The spelling of 82769721 in words is "eighty-two million, seven hundred sixty-nine thousand, seven hundred twenty-one".