28763388 has 72 divisors (see below), whose sum is σ = 78846768. Its totient is φ = 8805888.

The previous prime is 28763377. The next prime is 28763417. The reversal of 28763388 is 88336782.

28763388 is a `hidden beast` number, since 2 + 8 + 7 + 633 + 8 + 8 = 666.

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, 25770 + ... + 26862.

It is an arithmetic number, because the mean of its divisors is an integer number (1095094).

Almost surely, 2^28763388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28763388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39423384).

28763388 is an abundant number, since it is smaller than the sum of its proper divisors (50083380).

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

28763388 is a wasteful number, since it uses less digits than its factorization.

28763388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163 (or 1158 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28763388 is about 5363.1509395131. The cubic root of 28763388 is about 306.3938284291.

The spelling of 28763388 in words is "twenty-eight million, seven hundred sixty-three thousand, three hundred eighty-eight".