28378020 has 192 divisors, whose sum is σ = 95477760. Its totient is φ = 6220800.

The previous prime is 28378003. The next prime is 28378057. The reversal of 28378020 is 2087382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 388704 + ... + 388776.

It is an arithmetic number, because the mean of its divisors is an integer number (497280).

Almost surely, 2^28378020 is an apocalyptic number.

28378020 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 28378020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47738880).

28378020 is an abundant number, since it is smaller than the sum of its proper divisors (67099740).

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

28378020 is a wasteful number, since it uses less digits than its factorization.

28378020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28378020 is about 5327.1024018691. The cubic root of 28378020 is about 305.0193304957.

The spelling of 28378020 in words is "twenty-eight million, three hundred seventy-eight thousand, twenty".