28988313 has 16 divisors (see below), whose sum is σ = 40392000. Its totient is φ = 18468800.

The previous prime is 28988299. The next prime is 28988347. The reversal of 28988313 is 31388982.

It is a cyclic number.

It is not a de Polignac number, because 28988313 - 2⁶ = 28988249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28980313) 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, 7138 + ... + 10436.

It is an arithmetic number, because the mean of its divisors is an integer number (2524500).

Almost surely, 2^28988313 is an apocalyptic number.

It is an amenable number.

28988313 is a deficient number, since it is larger than the sum of its proper divisors (11403687).

28988313 is a wasteful number, since it uses less digits than its factorization.

28988313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432.

The product of its digits is 82944, while the sum is 42.

The square root of 28988313 is about 5384.0795870789. The cubic root of 28988313 is about 307.1904055672.

It can be divided in two parts, 2898 and 8313, that added together give a palindrome (11211).

The spelling of 28988313 in words is "twenty-eight million, nine hundred eighty-eight thousand, three hundred thirteen".