28457070 has 64 divisors (see below), whose sum is σ = 72493056. Its totient is φ = 7136640.

The previous prime is 28457047. The next prime is 28457071. The reversal of 28457070 is 7075482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33997 + ... + 34823.

It is an arithmetic number, because the mean of its divisors is an integer number (1132704).

Almost surely, 2^28457070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28457070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36246528).

28457070 is an abundant number, since it is smaller than the sum of its proper divisors (44035986).

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

28457070 is a wasteful number, since it uses less digits than its factorization.

28457070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28457070 is about 5334.5168478504. The cubic root of 28457070 is about 305.3022892083.

The spelling of 28457070 in words is "twenty-eight million, four hundred fifty-seven thousand, seventy".