28380551 has 8 divisors (see below), whose sum is σ = 29922144. Its totient is φ = 26864640.

The previous prime is 28380523. The next prime is 28380553. The reversal of 28380551 is 15508382.

It is a happy number.

28380551 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28380551 - 2¹⁸ = 28118407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4130 + ... + 8591.

It is an arithmetic number, because the mean of its divisors is an integer number (3740268).

Almost surely, 2^28380551 is an apocalyptic number.

28380551 is a deficient number, since it is larger than the sum of its proper divisors (1541593).

28380551 is a wasteful number, since it uses less digits than its factorization.

28380551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12841.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 28380551 is about 5327.3399553623. The cubic root of 28380551 is about 305.0283983233.

The spelling of 28380551 in words is "twenty-eight million, three hundred eighty thousand, five hundred fifty-one".