28772669 has 16 divisors (see below), whose sum is σ = 31776000. Its totient is φ = 25945920.

The previous prime is 28772647. The next prime is 28772683. The reversal of 28772669 is 96627782.

It is a cyclic number.

It is not a de Polignac number, because 28772669 - 2²⁴ = 11995453 is a prime.

It is a super-2 number, since 2×28772669² = 1655732962767122, 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 (28772629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43199 + ... + 43859.

It is an arithmetic number, because the mean of its divisors is an integer number (1986000).

Almost surely, 2^28772669 is an apocalyptic number.

28772669 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28772669 is a deficient number, since it is larger than the sum of its proper divisors (3003331).

28772669 is a wasteful number, since it uses less digits than its factorization.

28772669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788.

The product of its digits is 508032, while the sum is 47.

The square root of 28772669 is about 5364.0161260011. The cubic root of 28772669 is about 306.4267792915.

The spelling of 28772669 in words is "twenty-eight million, seven hundred seventy-two thousand, six hundred sixty-nine".