27978248 has 8 divisors (see below), whose sum is σ = 52459230. Its totient is φ = 13989120.

The previous prime is 27978239. The next prime is 27978257. The reversal of 27978248 is 84287972.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27978239) and next prime (27978257).

It can be written as a sum of positive squares in only one way, i.e., 27269284 + 708964 = 5222^2 + 842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×27978248² = 1565564722299008, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1748633 + ... + 1748648.

Almost surely, 2^27978248 is an apocalyptic number.

It is an amenable number.

27978248 is a deficient number, since it is larger than the sum of its proper divisors (24480982).

27978248 is a wasteful number, since it uses less digits than its factorization.

27978248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497287 (or 3497283 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 27978248 is about 5289.4468519875. The cubic root of 27978248 is about 303.5802436221.

The spelling of 27978248 in words is "twenty-seven million, nine hundred seventy-eight thousand, two hundred forty-eight".