28726780 has 12 divisors (see below), whose sum is σ = 60326280. Its totient is φ = 11490704.

The previous prime is 28726777. The next prime is 28726783. The reversal of 28726780 is 8762782.

It is an interprime number because it is at equal distance from previous prime (28726777) and next prime (28726783).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28726783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718150 + ... + 718189.

It is an arithmetic number, because the mean of its divisors is an integer number (5027190).

Almost surely, 2^28726780 is an apocalyptic number.

28726780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28726780 is an abundant number, since it is smaller than the sum of its proper divisors (31599500).

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

28726780 is a wasteful number, since it uses less digits than its factorization.

28726780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436348 (or 1436346 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 28726780 is about 5359.7369338429. The cubic root of 28726780 is about 306.2637878007.

The spelling of 28726780 in words is "twenty-eight million, seven hundred twenty-six thousand, seven hundred eighty".