28952989 has 8 divisors (see below), whose sum is σ = 33014520. Its totient is φ = 25153536.

The previous prime is 28952971. The next prime is 28952993. The reversal of 28952989 is 98925982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7022500 + 21930489 = 2650^2 + 4683^2 .

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 28952989 - 2¹¹ = 28950941 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 (28952909) 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, 65284 + ... + 65725.

It is an arithmetic number, because the mean of its divisors is an integer number (4126815).

Almost surely, 2^28952989 is an apocalyptic number.

It is an amenable number.

28952989 is a deficient number, since it is larger than the sum of its proper divisors (4061531).

28952989 is a wasteful number, since it uses less digits than its factorization.

28952989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131039.

The product of its digits is 933120, while the sum is 52.

The square root of 28952989 is about 5380.7981749923. The cubic root of 28952989 is about 307.0655781987.

It can be divided in two parts, 28952 and 989, that multiplied together give a triangular number (28633528 = T₇₅₆₇).

The spelling of 28952989 in words is "twenty-eight million, nine hundred fifty-two thousand, nine hundred eighty-nine".