28777716 has 36 divisors (see below), whose sum is σ = 79357824. Its totient is φ = 8720400.

The previous prime is 28777709. The next prime is 28777717. The reversal of 28777716 is 61777782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35940 + ... + 36731.

It is an arithmetic number, because the mean of its divisors is an integer number (2204384).

Almost surely, 2^28777716 is an apocalyptic number.

It is an amenable number.

28777716 is an abundant number, since it is smaller than the sum of its proper divisors (50580108).

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

28777716 is a wasteful number, since it uses less digits than its factorization.

28777716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72692 (or 72687 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 28777716 is about 5364.4865551141. The cubic root of 28777716 is about 306.4446949686. Note that the first 3 decimals are identical.

It can be divided in two parts, 2877771 and 6, that multiplied together give a triangular number (17266626 = T₅₈₇₆).

The spelling of 28777716 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred sixteen".