28948640 has 48 divisors (see below), whose sum is σ = 78164352. Its totient is φ = 9924864.

The previous prime is 28948639. The next prime is 28948669. The reversal of 28948640 is 4684982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11804 + ... + 14043.

It is an arithmetic number, because the mean of its divisors is an integer number (1628424).

Almost surely, 2^28948640 is an apocalyptic number.

28948640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28948640 is an abundant number, since it is smaller than the sum of its proper divisors (49215712).

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

28948640 is a wasteful number, since it uses less digits than its factorization.

28948640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25869 (or 25861 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28948640 is about 5380.3940376147. The cubic root of 28948640 is about 307.0502027560.

The spelling of 28948640 in words is "twenty-eight million, nine hundred forty-eight thousand, six hundred forty".