28891070 has 64 divisors (see below), whose sum is σ = 59222016. Its totient is φ = 10074240.

The previous prime is 28891069. The next prime is 28891073. The reversal of 28891070 is 7019882.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28891070.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269957 + ... + 270063.

It is an arithmetic number, because the mean of its divisors is an integer number (925344).

Almost surely, 2^28891070 is an apocalyptic number.

28891070 is an abundant number, since it is smaller than the sum of its proper divisors (30330946).

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

28891070 is a wasteful number, since it uses less digits than its factorization.

28891070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 28891070 is about 5375.0413951894. The cubic root of 28891070 is about 306.8465246661.

The spelling of 28891070 in words is "twenty-eight million, eight hundred ninety-one thousand, seventy".