28880377 has 4 divisors (see below), whose sum is σ = 28892916. Its totient is φ = 28867840.

The previous prime is 28880353. The next prime is 28880381. The reversal of 28880377 is 77308882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15492096 + 13388281 = 3936^2 + 3659^2 .

It is a cyclic number.

It is not a de Polignac number, because 28880377 - 2¹⁹ = 28356089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28880077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708 + ... + 7789.

It is an arithmetic number, because the mean of its divisors is an integer number (7223229).

Almost surely, 2^28880377 is an apocalyptic number.

It is an amenable number.

28880377 is a deficient number, since it is larger than the sum of its proper divisors (12539).

28880377 is an equidigital number, since it uses as much as digits as its factorization.

28880377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12538.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 28880377 is about 5374.0466131213. The cubic root of 28880377 is about 306.8086638926.

The spelling of 28880377 in words is "twenty-eight million, eight hundred eighty thousand, three hundred seventy-seven".