28387996 has 48 divisors (see below), whose sum is σ = 61641216. Its totient is φ = 11139264.

The previous prime is 28387987. The next prime is 28387999. The reversal of 28387996 is 69978382.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60555 + ... + 61021.

It is an arithmetic number, because the mean of its divisors is an integer number (1284192).

Almost surely, 2^28387996 is an apocalyptic number.

28387996 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 28387996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30820608).

28387996 is an abundant number, since it is smaller than the sum of its proper divisors (33253220).

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

28387996 is a wasteful number, since it uses less digits than its factorization.

28387996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 656 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 28387996 is about 5328.0386635234. The cubic root of 28387996 is about 305.0550684406.

The spelling of 28387996 in words is "twenty-eight million, three hundred eighty-seven thousand, nine hundred ninety-six".