28486784 has 16 divisors (see below), whose sum is σ = 56751270. Its totient is φ = 14243328.

The previous prime is 28486771. The next prime is 28486819. The reversal of 28486784 is 48768482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26296384 + 2190400 = 5128^2 + 1480^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×28486784² = 1622993725325312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111149 + ... + 111404.

Almost surely, 2^28486784 is an apocalyptic number.

It is an amenable number.

28486784 is a deficient number, since it is larger than the sum of its proper divisors (28264486).

28486784 is an equidigital number, since it uses as much as digits as its factorization.

28486784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222567 (or 222555 counting only the distinct ones).

The product of its digits is 688128, while the sum is 47.

The square root of 28486784 is about 5337.3011906768. The cubic root of 28486784 is about 305.4085146744.

The spelling of 28486784 in words is "twenty-eight million, four hundred eighty-six thousand, seven hundred eighty-four".