28772469 has 24 divisors (see below), whose sum is σ = 46858560. Its totient is φ = 17435880.

The previous prime is 28772467. The next prime is 28772489. The reversal of 28772469 is 96427782.

It is not a de Polignac number, because 28772469 - 2¹ = 28772467 is a prime.

It is a super-2 number, since 2×28772469² = 1655709944711922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1137 + ... + 7670.

It is an arithmetic number, because the mean of its divisors is an integer number (1952440).

Almost surely, 2^28772469 is an apocalyptic number.

It is an amenable number.

28772469 is a deficient number, since it is larger than the sum of its proper divisors (18086091).

28772469 is a wasteful number, since it uses less digits than its factorization.

28772469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8838 (or 8821 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 28772469 is about 5363.9974832209. The cubic root of 28772469 is about 306.4260692949.

It can be divided in two parts, 28772 and 469, that added together give a square (29241 = 171²).

The spelling of 28772469 in words is "twenty-eight million, seven hundred seventy-two thousand, four hundred sixty-nine".