28690669 has 8 divisors (see below), whose sum is σ = 32830208. Its totient is φ = 24561360.

The previous prime is 28690661. The next prime is 28690681. The reversal of 28690669 is 96609682.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28690669 - 2³ = 28690661 is a prime.

It is a super-2 number, since 2×28690669² = 1646308975335122, 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 (28690661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4924 + ... + 9034.

It is an arithmetic number, because the mean of its divisors is an integer number (4103776).

Almost surely, 2^28690669 is an apocalyptic number.

28690669 is the 3093-rd hex number.

It is an amenable number.

28690669 is a deficient number, since it is larger than the sum of its proper divisors (4139539).

28690669 is an equidigital number, since it uses as much as digits as its factorization.

28690669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 28690669 is about 5356.3671457435. The cubic root of 28690669 is about 306.1354043551.

The spelling of 28690669 in words is "twenty-eight million, six hundred ninety thousand, six hundred sixty-nine".