28888780 has 24 divisors (see below), whose sum is σ = 64235808. Its totient is φ = 10875648.

The previous prime is 28888771. The next prime is 28888841. The reversal of 28888780 is 8788882.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42144 + ... + 42823.

It is an arithmetic number, because the mean of its divisors is an integer number (2676492).

Almost surely, 2^28888780 is an apocalyptic number.

28888780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28888780 is an abundant number, since it is smaller than the sum of its proper divisors (35347028).

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

28888780 is a wasteful number, since it uses less digits than its factorization.

28888780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84993 (or 84991 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 49.

The square root of 28888780 is about 5374.8283693528. The cubic root of 28888780 is about 306.8384172346.

The spelling of 28888780 in words is "twenty-eight million, eight hundred eighty-eight thousand, seven hundred eighty".