28777750 has 32 divisors (see below), whose sum is σ = 55145376. Its totient is φ = 11239200.

The previous prime is 28777739. The next prime is 28777769. The reversal of 28777750 is 5777782.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 28777697 and 28777706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9412 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (1723293).

Almost surely, 2^28777750 is an apocalyptic number.

28777750 is a deficient number, since it is larger than the sum of its proper divisors (26367626).

28777750 is a wasteful number, since it uses less digits than its factorization.

28777750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 192080, while the sum is 43.

The square root of 28777750 is about 5364.4897241024. The cubic root of 28777750 is about 306.4448156536. Note that the first 3 decimals are identical.

The spelling of 28777750 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred fifty".