28197870 has 64 divisors (see below), whose sum is σ = 69984000. Its totient is φ = 7268096.

The previous prime is 28197847. The next prime is 28197877. The reversal of 28197870 is 7879182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157441 + ... + 157619.

It is an arithmetic number, because the mean of its divisors is an integer number (1093500).

Almost surely, 2^28197870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28197870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34992000).

28197870 is an abundant number, since it is smaller than the sum of its proper divisors (41786130).

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

28197870 is a wasteful number, since it uses less digits than its factorization.

28197870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 28197870 is about 5310.1666640511. The cubic root of 28197870 is about 304.3725162726.

The spelling of 28197870 in words is "twenty-eight million, one hundred ninety-seven thousand, eight hundred seventy".