28357680 has 160 divisors (see below), whose sum is σ = 96868800. Its totient is φ = 6819840.

The previous prime is 28357673. The next prime is 28357687. The reversal of 28357680 is 8675382.

It is an interprime number because it is at equal distance from previous prime (28357673) and next prime (28357687).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28357687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190246 + ... + 190394.

It is an arithmetic number, because the mean of its divisors is an integer number (605430).

Almost surely, 2^28357680 is an apocalyptic number.

28357680 is a gapful number since it is divisible by the number (20) 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 28357680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48434400).

28357680 is an abundant number, since it is smaller than the sum of its proper divisors (68511120).

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

28357680 is a wasteful number, since it uses less digits than its factorization.

28357680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 28357680 is about 5325.1929542506. The cubic root of 28357680 is about 304.9464386820.

The spelling of 28357680 in words is "twenty-eight million, three hundred fifty-seven thousand, six hundred eighty".