155278 has 8 divisors (see below), whose sum is σ = 246672. Its totient is φ = 73056.

The previous prime is 155269. The next prime is 155291. The reversal of 155278 is 872551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×155278² = 48222514568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

155278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2250 + ... + 2317.

It is an arithmetic number, because the mean of its divisors is an integer number (30834).

2¹⁵⁵²⁷⁸ is an apocalyptic number.

155278 is a deficient number, since it is larger than the sum of its proper divisors (91394).

155278 is a wasteful number, since it uses less digits than its factorization.

155278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586.

The product of its digits is 2800, while the sum is 28.

The square root of 155278 is about 394.0532958878. The cubic root of 155278 is about 53.7489489609.

The spelling of 155278 in words is "one hundred fifty-five thousand, two hundred seventy-eight".