28870842 has 192 divisors, whose sum is σ = 85800960. Its totient is φ = 6272640.

The previous prime is 28870837. The next prime is 28870859. The reversal of 28870842 is 24807882.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28870842.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1255243 + ... + 1255265.

It is an arithmetic number, because the mean of its divisors is an integer number (446880).

Almost surely, 2^28870842 is an apocalyptic number.

28870842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28870842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42900480).

28870842 is an abundant number, since it is smaller than the sum of its proper divisors (56930118).

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

28870842 is a wasteful number, since it uses less digits than its factorization.

28870842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28870842 is about 5373.1594057873. The cubic root of 28870842 is about 306.7748953743.

The spelling of 28870842 in words is "twenty-eight million, eight hundred seventy thousand, eight hundred forty-two".