28055544 has 48 divisors (see below), whose sum is σ = 77102760. Its totient is φ = 8500800.

The previous prime is 28055539. The next prime is 28055549. The reversal of 28055544 is 44555082.

It is an interprime number because it is at equal distance from previous prime (28055539) and next prime (28055549).

It is a super-2 number, since 2×28055544² = 1574227098271872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28055549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1927 + ... + 7734.

Almost surely, 2^28055544 is an apocalyptic number.

28055544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28055544 is an abundant number, since it is smaller than the sum of its proper divisors (49047216).

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

28055544 is a wasteful number, since it uses less digits than its factorization.

28055544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9692 (or 9677 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 33.

The square root of 28055544 is about 5296.7484365410. The cubic root of 28055544 is about 303.8595553939.

The spelling of 28055544 in words is "twenty-eight million, fifty-five thousand, five hundred forty-four".