28542132 has 30 divisors (see below), whose sum is σ = 74615618. Its totient is φ = 9513936.

The previous prime is 28542131. The next prime is 28542139. The reversal of 28542132 is 23124582.

It can be written as a sum of positive squares in only one way, i.e., 15968016 + 12574116 = 3996^2 + 3546^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28542096 and 28542105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542131) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43723 + ... + 44370.

Almost surely, 2^28542132 is an apocalyptic number.

It is an amenable number.

28542132 is an abundant number, since it is smaller than the sum of its proper divisors (46073486).

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

28542132 is a wasteful number, since it uses less digits than its factorization.

28542132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88109 (or 88098 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28542132 is about 5342.4836920668. The cubic root of 28542132 is about 305.6061831164.

The spelling of 28542132 in words is "twenty-eight million, five hundred forty-two thousand, one hundred thirty-two".