28861532 has 24 divisors (see below), whose sum is σ = 60762240. Its totient is φ = 11718000.

The previous prime is 28861489. The next prime is 28861537. The reversal of 28861532 is 23516882.

It is a junction number, because it is equal to n+sod(n) for n = 28861492 and 28861501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861537) 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, 26594 + ... + 27657.

It is an arithmetic number, because the mean of its divisors is an integer number (2531760).

Almost surely, 2^28861532 is an apocalyptic number.

It is an amenable number.

28861532 is an abundant number, since it is smaller than the sum of its proper divisors (31900708).

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

28861532 is a wasteful number, since it uses less digits than its factorization.

28861532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54281 (or 54279 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 28861532 is about 5372.2929927546. The cubic root of 28861532 is about 306.7419165263.

The spelling of 28861532 in words is "twenty-eight million, eight hundred sixty-one thousand, five hundred thirty-two".