28931629 has 4 divisors (see below), whose sum is σ = 29405980. Its totient is φ = 28457280.

The previous prime is 28931621. The next prime is 28931641. The reversal of 28931629 is 92613982.

It is a happy number.

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 522729 + 28408900 = 723^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 28931629 - 2³ = 28931621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28931591 and 28931600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237084 + ... + 237205.

It is an arithmetic number, because the mean of its divisors is an integer number (7351495).

Almost surely, 2^28931629 is an apocalyptic number.

It is an amenable number.

28931629 is a deficient number, since it is larger than the sum of its proper divisors (474351).

28931629 is an equidigital number, since it uses as much as digits as its factorization.

28931629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474350.

The product of its digits is 46656, while the sum is 40.

The square root of 28931629 is about 5378.8129731382. The cubic root of 28931629 is about 306.9900473171.

The spelling of 28931629 in words is "twenty-eight million, nine hundred thirty-one thousand, six hundred twenty-nine".