155278079 has 8 divisors (see below), whose sum is σ = 170978688. Its totient is φ = 139841560.

The previous prime is 155278063. The next prime is 155278087. The reversal of 155278079 is 970872551.

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

It is a cyclic number.

It is not a de Polignac number, because 155278079 - 2⁴ = 155278063 is a prime.

It is a super-2 number, since 2×155278079² = 48222563635860482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155278379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64787 + ... + 67140.

It is an arithmetic number, because the mean of its divisors is an integer number (21372336).

Almost surely, 2^155278079 is an apocalyptic number.

155278079 is a deficient number, since it is larger than the sum of its proper divisors (15700609).

155278079 is a wasteful number, since it uses less digits than its factorization.

155278079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132045.

The product of its (nonzero) digits is 176400, while the sum is 44.

The square root of 155278079 is about 12461.0625148901. The cubic root of 155278079 is about 537.4895807607.

The spelling of 155278079 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, seventy-nine".