155678 has 4 divisors (see below), whose sum is σ = 233520. Its totient is φ = 77838.

The previous prime is 155671. The next prime is 155689. The reversal of 155678 is 876551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 876551 = 13 ⋅67427.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155671) by changing a digit.

155678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38918 + ... + 38921.

It is an arithmetic number, because the mean of its divisors is an integer number (58380).

2¹⁵⁵⁶⁷⁸ is an apocalyptic number.

155678 is a deficient number, since it is larger than the sum of its proper divisors (77842).

155678 is an equidigital number, since it uses as much as digits as its factorization.

155678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77841.

The product of its digits is 8400, while the sum is 32.

The square root of 155678 is about 394.5605150037. The cubic root of 155678 is about 53.7950622648.

The spelling of 155678 in words is "one hundred fifty-five thousand, six hundred seventy-eight".