28750140 has 60 divisors (see below), whose sum is σ = 90195336. Its totient is φ = 7666272.

The previous prime is 28750129. The next prime is 28750157. The reversal of 28750140 is 4105782.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7254 + ... + 10493.

Almost surely, 2^28750140 is an apocalyptic number.

28750140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28750140 is an abundant number, since it is smaller than the sum of its proper divisors (61445196).

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

28750140 is a wasteful number, since it uses less digits than its factorization.

28750140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17768 (or 17757 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28750140 is about 5361.9157024332. The cubic root of 28750140 is about 306.3467810183.

The spelling of 28750140 in words is "twenty-eight million, seven hundred fifty thousand, one hundred forty".