28161588 has 192 divisors, whose sum is σ = 90091008. Its totient is φ = 6635520.

The previous prime is 28161569. The next prime is 28161599. The reversal of 28161588 is 88516182.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (30720) is a multiple of the sum of its prime divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 686848 + ... + 686888.

It is an arithmetic number, because the mean of its divisors is an integer number (469224).

Almost surely, 2^28161588 is an apocalyptic number.

28161588 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28161588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45045504).

28161588 is an abundant number, since it is smaller than the sum of its proper divisors (61929420).

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

28161588 is a wasteful number, since it uses less digits than its factorization.

28161588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 120 counting only the distinct ones).

The product of its digits is 30720, while the sum is 39.

The square root of 28161588 is about 5306.7492874640. The cubic root of 28161588 is about 304.2419155872.

The spelling of 28161588 in words is "twenty-eight million, one hundred sixty-one thousand, five hundred eighty-eight".