28777792 has 14 divisors (see below), whose sum is σ = 57106058. Its totient is φ = 14388864.

The previous prime is 28777783. The next prime is 28777811. The reversal of 28777792 is 29777782.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 8202496 = 4536^2 + 2864^2 .

It is a super-2 number, since 2×28777792² = 1656322624790528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224763 + ... + 224890.

Almost surely, 2^28777792 is an apocalyptic number.

It is an amenable number.

28777792 is a deficient number, since it is larger than the sum of its proper divisors (28328266).

28777792 is an equidigital number, since it uses as much as digits as its factorization.

28777792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449665 (or 449655 counting only the distinct ones).

The product of its digits is 691488, while the sum is 49.

The square root of 28777792 is about 5364.4936387324. The cubic root of 28777792 is about 306.4449647349. Note that the first 3 decimals are identical.

The spelling of 28777792 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred ninety-two".