28777412 has 6 divisors (see below), whose sum is σ = 50360478. Its totient is φ = 14388704.

The previous prime is 28777391. The next prime is 28777423. The reversal of 28777412 is 21477782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 8491396 = 4504^2 + 2914^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3597173 + ... + 3597180.

It is an arithmetic number, because the mean of its divisors is an integer number (8393413).

Almost surely, 2^28777412 is an apocalyptic number.

It is an amenable number.

28777412 is a deficient number, since it is larger than the sum of its proper divisors (21583066).

28777412 is a wasteful number, since it uses less digits than its factorization.

28777412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7194357 (or 7194355 counting only the distinct ones).

The product of its digits is 43904, while the sum is 38.

The square root of 28777412 is about 5364.4582205475. The cubic root of 28777412 is about 306.4436158985.

The spelling of 28777412 in words is "twenty-eight million, seven hundred seventy-seven thousand, four hundred twelve".