28699488 has 96 divisors (see below), whose sum is σ = 85276800. Its totient is φ = 9387648.

The previous prime is 28699483. The next prime is 28699499. The reversal of 28699488 is 88499682.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×28699488² = 1647321222924288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28699483) 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, 50695 + ... + 51257.

It is an arithmetic number, because the mean of its divisors is an integer number (888300).

Almost surely, 2^28699488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28699488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42638400).

28699488 is an abundant number, since it is smaller than the sum of its proper divisors (56577312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28699488 is a wasteful number, since it uses less digits than its factorization.

28699488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 627 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 28699488 is about 5357.1903083613. The cubic root of 28699488 is about 306.1667679964.

The spelling of 28699488 in words is "twenty-eight million, six hundred ninety-nine thousand, four hundred eighty-eight".