28551556 has 48 divisors (see below), whose sum is σ = 57697920. Its totient is φ = 12235520.

The previous prime is 28551553. The next prime is 28551557. The reversal of 28551556 is 65515582.

It is a super-2 number, since 2×28551556² = 1630382700042272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28551553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89910 + ... + 90226.

It is an arithmetic number, because the mean of its divisors is an integer number (1202040).

Almost surely, 2^28551556 is an apocalyptic number.

It is an amenable number.

28551556 is an abundant number, since it is smaller than the sum of its proper divisors (29146364).

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

28551556 is a wasteful number, since it uses less digits than its factorization.

28551556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 442 counting only the distinct ones).

The product of its digits is 60000, while the sum is 37.

The square root of 28551556 is about 5343.3656060577. The cubic root of 28551556 is about 305.6398142849.

It can be divided in two parts, 2 and 8551556, that added together give a palindrome (8551558).

The spelling of 28551556 in words is "twenty-eight million, five hundred fifty-one thousand, five hundred fifty-six".