28734989 has 4 divisors (see below), whose sum is σ = 29031324. Its totient is φ = 28438656.

The previous prime is 28734967. The next prime is 28734991. The reversal of 28734989 is 98943782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15288100 + 13446889 = 3910^2 + 3667^2 .

It is a cyclic number.

It is not a de Polignac number, because 28734989 - 2⁸ = 28734733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28734919) 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, 148022 + ... + 148215.

It is an arithmetic number, because the mean of its divisors is an integer number (7257831).

Almost surely, 2^28734989 is an apocalyptic number.

It is an amenable number.

28734989 is a deficient number, since it is larger than the sum of its proper divisors (296335).

28734989 is an equidigital number, since it uses as much as digits as its factorization.

28734989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296334.

The product of its digits is 870912, while the sum is 50.

The square root of 28734989 is about 5360.5026816522. The cubic root of 28734989 is about 306.2929577946.

The spelling of 28734989 in words is "twenty-eight million, seven hundred thirty-four thousand, nine hundred eighty-nine".