28001376 has 144 divisors (see below), whose sum is σ = 89251344. Its totient is φ = 8584704.

The previous prime is 28001359. The next prime is 28001399. The reversal of 28001376 is 67310082.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100950 + ... + 101226.

It is an arithmetic number, because the mean of its divisors is an integer number (619801).

Almost surely, 2^28001376 is an apocalyptic number.

28001376 is a gapful number since it is divisible by the number (26) 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 28001376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44625672).

28001376 is an abundant number, since it is smaller than the sum of its proper divisors (61249968).

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

28001376 is a wasteful number, since it uses less digits than its factorization.

28001376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 28001376 is about 5291.6326403105. The cubic root of 28001376 is about 303.6638713280.

The spelling of 28001376 in words is "twenty-eight million, one thousand, three hundred seventy-six".