28907928 has 80 divisors (see below), whose sum is σ = 92550480. Its totient is φ = 8258112.

The previous prime is 28907897. The next prime is 28907933. The reversal of 28907928 is 82970982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1350 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (1156881).

Almost surely, 2^28907928 is an apocalyptic number.

28907928 is a gapful number since it is divisible by the number (28) 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 28907928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46275240).

28907928 is an abundant number, since it is smaller than the sum of its proper divisors (63642552).

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

28907928 is a wasteful number, since it uses less digits than its factorization.

28907928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6398 (or 6385 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 28907928 is about 5376.6093404673. The cubic root of 28907928 is about 306.9061949254.

The spelling of 28907928 in words is "twenty-eight million, nine hundred seven thousand, nine hundred twenty-eight".