28141440 has 64 divisors (see below), whose sum is σ = 89706960. Its totient is φ = 7503872.

The previous prime is 28141439. The next prime is 28141441. The reversal of 28141440 is 4414182.

It is an interprime number because it is at equal distance from previous prime (28141439) and next prime (28141441).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28141440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28141441) 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, 5409 + ... + 9248.

Almost surely, 2^28141440 is an apocalyptic number.

28141440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28141440 is an abundant number, since it is smaller than the sum of its proper divisors (61565520).

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

28141440 is a wasteful number, since it uses less digits than its factorization.

28141440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14679 (or 14667 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28141440 is about 5304.8506105262. The cubic root of 28141440 is about 304.1693424005.

The spelling of 28141440 in words is "twenty-eight million, one hundred forty-one thousand, four hundred forty".