28707492 has 72 divisors (see below), whose sum is σ = 78025248. Its totient is φ = 8180480.

The previous prime is 28707487. The next prime is 28707493. The reversal of 28707492 is 29470782.

It is a self number, because there is not a number n which added to its sum of digits gives 28707492.

It is not an unprimeable number, because it can be changed into a prime (28707493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24103 + ... + 25265.

It is an arithmetic number, because the mean of its divisors is an integer number (1083684).

Almost surely, 2^28707492 is an apocalyptic number.

28707492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28707492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39012624).

28707492 is an abundant number, since it is smaller than the sum of its proper divisors (49317756).

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

28707492 is a wasteful number, since it uses less digits than its factorization.

28707492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 28707492 is about 5357.9372896666. The cubic root of 28707492 is about 306.1952276335.

The spelling of 28707492 in words is "twenty-eight million, seven hundred seven thousand, four hundred ninety-two".