28909892 has 24 divisors (see below), whose sum is σ = 55896960. Its totient is φ = 12972960.

The previous prime is 28909891. The next prime is 28909921. The reversal of 28909892 is 29890982.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28909891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (2329040).

Almost surely, 2^28909892 is an apocalyptic number.

28909892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28909892 is a deficient number, since it is larger than the sum of its proper divisors (26987068).

28909892 is a wasteful number, since it uses less digits than its factorization.

28909892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8411 (or 8409 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28909892 is about 5376.7919803541. The cubic root of 28909892 is about 306.9131451540.

The spelling of 28909892 in words is "twenty-eight million, nine hundred nine thousand, eight hundred ninety-two".