28777949 has 4 divisors (see below), whose sum is σ = 28997760. Its totient is φ = 28558140.

The previous prime is 28777939. The next prime is 28777961. The reversal of 28777949 is 94977782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28777949 - 2¹² = 28773853 is a prime.

It is a Duffinian number.

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 28777949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109709 + ... + 109970.

It is an arithmetic number, because the mean of its divisors is an integer number (7249440).

Almost surely, 2^28777949 is an apocalyptic number.

It is an amenable number.

28777949 is a deficient number, since it is larger than the sum of its proper divisors (219811).

28777949 is a wasteful number, since it uses less digits than its factorization.

28777949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219810.

The product of its digits is 1778112, while the sum is 53.

The square root of 28777949 is about 5364.5082719668. The cubic root of 28777949 is about 306.4455220139.

The spelling of 28777949 in words is "twenty-eight million, seven hundred seventy-seven thousand, nine hundred forty-nine".