28061556 has 24 divisors (see below), whose sum is σ = 68923680. Its totient is φ = 8861472.

The previous prime is 28061519. The next prime is 28061557. The reversal of 28061556 is 65516082.

It is a super-2 number, since 2×28061556² = 1574901850282272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061557) 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, 61311 + ... + 61766.

It is an arithmetic number, because the mean of its divisors is an integer number (2871820).

Almost surely, 2^28061556 is an apocalyptic number.

It is an amenable number.

28061556 is an abundant number, since it is smaller than the sum of its proper divisors (40862124).

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

28061556 is a wasteful number, since it uses less digits than its factorization.

28061556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123103 (or 123101 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 28061556 is about 5297.3159241261. The cubic root of 28061556 is about 303.8812584505.

The spelling of 28061556 in words is "twenty-eight million, sixty-one thousand, five hundred fifty-six".