28540044 has 54 divisors (see below), whose sum is σ = 78135876. Its totient is φ = 8779680.

The previous prime is 28540027. The next prime is 28540051. The reversal of 28540044 is 44004582.

It is a super-2 number, since 2×28540044² = 1629068223043872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3739 + ... + 8429.

Almost surely, 2^28540044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28540044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39067938).

28540044 is an abundant number, since it is smaller than the sum of its proper divisors (49595832).

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

28540044 is a wasteful number, since it uses less digits than its factorization.

28540044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727 (or 4709 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28540044 is about 5342.2882737643. The cubic root of 28540044 is about 305.5987307267.

The spelling of 28540044 in words is "twenty-eight million, five hundred forty thousand, forty-four".