28907669 has 4 divisors (see below), whose sum is σ = 33037344. Its totient is φ = 24777996.

The previous prime is 28907663. The next prime is 28907687. The reversal of 28907669 is 96670982.

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 28907669 - 2¹² = 28903573 is a prime.

It is a super-2 number, since 2×28907669² = 1671306654027122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28907663) 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, 2064827 + ... + 2064840.

It is an arithmetic number, because the mean of its divisors is an integer number (8259336).

Almost surely, 2^28907669 is an apocalyptic number.

It is an amenable number.

28907669 is a deficient number, since it is larger than the sum of its proper divisors (4129675).

28907669 is an equidigital number, since it uses as much as digits as its factorization.

28907669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129674.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 28907669 is about 5376.5852546017. The cubic root of 28907669 is about 306.9052783494.

The spelling of 28907669 in words is "twenty-eight million, nine hundred seven thousand, six hundred sixty-nine".