28913929 has 4 divisors (see below), whose sum is σ = 31542480. Its totient is φ = 26285380.

The previous prime is 28913903. The next prime is 28913947. The reversal of 28913929 is 92931982.

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 not a de Polignac number, because 28913929 - 2¹⁵ = 28881161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28913959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314259 + ... + 1314280.

It is an arithmetic number, because the mean of its divisors is an integer number (7885620).

Almost surely, 2^28913929 is an apocalyptic number.

It is an amenable number.

28913929 is a deficient number, since it is larger than the sum of its proper divisors (2628551).

28913929 is a wasteful number, since it uses less digits than its factorization.

28913929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628550.

The product of its digits is 69984, while the sum is 43.

The square root of 28913929 is about 5377.1673769746. The cubic root of 28913929 is about 306.9274303532.

The spelling of 28913929 in words is "twenty-eight million, nine hundred thirteen thousand, nine hundred twenty-nine".