28999729 has 4 divisors (see below), whose sum is σ = 31636080. Its totient is φ = 26363380.

The previous prime is 28999727. The next prime is 28999741. The reversal of 28999729 is 92799982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28999729 - 2¹ = 28999727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28999729.

It is not an unprimeable number, because it can be changed into a prime (28999723) 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, 1318159 + ... + 1318180.

It is an arithmetic number, because the mean of its divisors is an integer number (7909020).

Almost surely, 2^28999729 is an apocalyptic number.

It is an amenable number.

28999729 is a deficient number, since it is larger than the sum of its proper divisors (2636351).

28999729 is a wasteful number, since it uses less digits than its factorization.

28999729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636350.

The product of its digits is 1469664, while the sum is 55.

The square root of 28999729 is about 5385.1396453574. The cubic root of 28999729 is about 307.2307255566.

The spelling of 28999729 in words is "twenty-eight million, nine hundred ninety-nine thousand, seven hundred twenty-nine".