82721629 has 4 divisors (see below), whose sum is σ = 83854876. Its totient is φ = 81588384.

The previous prime is 82721581. The next prime is 82721657. The reversal of 82721629 is 92612728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68508729 + 14212900 = 8277^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 82721629 - 2¹³ = 82713437 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 (82721689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566514 + ... + 566659.

It is an arithmetic number, because the mean of its divisors is an integer number (20963719).

Almost surely, 2^82721629 is an apocalyptic number.

It is an amenable number.

82721629 is a deficient number, since it is larger than the sum of its proper divisors (1133247).

82721629 is a wasteful number, since it uses less digits than its factorization.

82721629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133246.

The product of its digits is 24192, while the sum is 37.

The square root of 82721629 is about 9095.1431544534. The cubic root of 82721629 is about 435.7188607139.

The spelling of 82721629 in words is "eighty-two million, seven hundred twenty-one thousand, six hundred twenty-nine".