28440440 has 32 divisors (see below), whose sum is σ = 73133280. Its totient is φ = 9750912.

The previous prime is 28440427. The next prime is 28440449. The reversal of 28440440 is 4404482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440449) 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, 50507 + ... + 51066.

It is an arithmetic number, because the mean of its divisors is an integer number (2285415).

Almost surely, 2^28440440 is an apocalyptic number.

28440440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28440440 is an abundant number, since it is smaller than the sum of its proper divisors (44692840).

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

28440440 is a wasteful number, since it uses less digits than its factorization.

28440440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101591 (or 101587 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 28440440 is about 5332.9579034528. The cubic root of 28440440 is about 305.2428058484.

The spelling of 28440440 in words is "twenty-eight million, four hundred forty thousand, four hundred forty".