28780269 has 32 divisors (see below), whose sum is σ = 48890880. Its totient is φ = 14660352.

The previous prime is 28780261. The next prime is 28780289. The reversal of 28780269 is 96208782.

It is a happy number.

It is not a de Polignac number, because 28780269 - 2³ = 28780261 is a prime.

It is a super-2 number, since 2×28780269² = 1656607767424722, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28780269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780261) 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, 4662 + ... + 8904.

It is an arithmetic number, because the mean of its divisors is an integer number (1527840).

Almost surely, 2^28780269 is an apocalyptic number.

It is an amenable number.

28780269 is a deficient number, since it is larger than the sum of its proper divisors (20110611).

28780269 is a wasteful number, since it uses less digits than its factorization.

28780269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 28780269 is about 5364.7245036442. The cubic root of 28780269 is about 306.4537567275.

The spelling of 28780269 in words is "twenty-eight million, seven hundred eighty thousand, two hundred sixty-nine".