28691029 has 4 divisors (see below), whose sum is σ = 29095200. Its totient is φ = 28286860.

The previous prime is 28691017. The next prime is 28691059. The reversal of 28691029 is 92019682.

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 28691029 - 2⁵ = 28690997 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 (28691059) 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, 201979 + ... + 202120.

It is an arithmetic number, because the mean of its divisors is an integer number (7273800).

Almost surely, 2^28691029 is an apocalyptic number.

It is an amenable number.

28691029 is a deficient number, since it is larger than the sum of its proper divisors (404171).

28691029 is an equidigital number, since it uses as much as digits as its factorization.

28691029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404170.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 28691029 is about 5356.4007505040. The cubic root of 28691029 is about 306.1366847747.

The spelling of 28691029 in words is "twenty-eight million, six hundred ninety-one thousand, twenty-nine".