28787740 has 24 divisors (see below), whose sum is σ = 61930512. Its totient is φ = 11233920.

The previous prime is 28787729. The next prime is 28787741. The reversal of 28787740 is 4778782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28787741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16734 + ... + 18373.

It is an arithmetic number, because the mean of its divisors is an integer number (2580438).

Almost surely, 2^28787740 is an apocalyptic number.

28787740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28787740 is an abundant number, since it is smaller than the sum of its proper divisors (33142772).

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

28787740 is a wasteful number, since it uses less digits than its factorization.

28787740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35157 (or 35155 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 28787740 is about 5365.4207663519. The cubic root of 28787740 is about 306.4802716283.

The spelling of 28787740 in words is "twenty-eight million, seven hundred eighty-seven thousand, seven hundred forty".