28797940 has 24 divisors (see below), whose sum is σ = 61381152. Its totient is φ = 11346720.

The previous prime is 28797919. The next prime is 28797947. The reversal of 28797940 is 4979782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28797947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9406 + ... + 12085.

It is an arithmetic number, because the mean of its divisors is an integer number (2557548).

Almost surely, 2^28797940 is an apocalyptic number.

28797940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28797940 is an abundant number, since it is smaller than the sum of its proper divisors (32583212).

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

28797940 is a wasteful number, since it uses less digits than its factorization.

28797940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21567 (or 21565 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 28797940 is about 5366.3712133992. The cubic root of 28797940 is about 306.5164644617.

The spelling of 28797940 in words is "twenty-eight million, seven hundred ninety-seven thousand, nine hundred forty".