28011270 has 32 divisors (see below), whose sum is σ = 76831488. Its totient is φ = 6402528.

The previous prime is 28011251. The next prime is 28011281. The reversal of 28011270 is 7211082.

28011270 = 127² + 128² + ... + 441².

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 66484 + ... + 66903.

It is an arithmetic number, because the mean of its divisors is an integer number (2400984).

Almost surely, 2^28011270 is an apocalyptic number.

28011270 is an abundant number, since it is smaller than the sum of its proper divisors (48820218).

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

28011270 is a wasteful number, since it uses less digits than its factorization.

28011270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133404.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 28011270 is about 5292.5674298964. The cubic root of 28011270 is about 303.6996326248.

The spelling of 28011270 in words is "twenty-eight million, eleven thousand, two hundred seventy".