28260720 has 60 divisors (see below), whose sum is σ = 94911336. Its totient is φ = 7536000.

The previous prime is 28260697. The next prime is 28260737. The reversal of 28260720 is 2706282.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18906 + ... + 20345.

Almost surely, 2^28260720 is an apocalyptic number.

28260720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28260720 is an abundant number, since it is smaller than the sum of its proper divisors (66650616).

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

28260720 is a wasteful number, since it uses less digits than its factorization.

28260720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39270 (or 39261 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28260720 is about 5316.0812634872. The cubic root of 28260720 is about 304.5984862656.

The spelling of 28260720 in words is "twenty-eight million, two hundred sixty thousand, seven hundred twenty".