13577978 has 4 divisors (see below), whose sum is σ = 20366970. Its totient is φ = 6788988.

The previous prime is 13577959. The next prime is 13577987. The reversal of 13577978 is 87977531.

13577978 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87977531 = 2663 ⋅33037.

It can be written as a sum of positive squares in only one way, i.e., 9138529 + 4439449 = 3023^2 + 2107^2 .

It is a super-2 number, since 2×13577978² = 368722973136968, 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, 3394493 + ... + 3394496.

Almost surely, 2^13577978 is an apocalyptic number.

13577978 is a deficient number, since it is larger than the sum of its proper divisors (6788992).

13577978 is an equidigital number, since it uses as much as digits as its factorization.

13577978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788991.

The product of its digits is 370440, while the sum is 47.

The square root of 13577978 is about 3684.8307966581. The cubic root of 13577978 is about 238.5677311014.

The spelling of 13577978 in words is "thirteen million, five hundred seventy-seven thousand, nine hundred seventy-eight".