155720258 has 8 divisors (see below), whose sum is σ = 243736128. Its totient is φ = 74474884.

The previous prime is 155720237. The next prime is 155720267. The reversal of 155720258 is 852027551.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1692566 + ... + 1692657.

It is an arithmetic number, because the mean of its divisors is an integer number (30467016).

Almost surely, 2^155720258 is an apocalyptic number.

155720258 is a deficient number, since it is larger than the sum of its proper divisors (88015870).

155720258 is a wasteful number, since it uses less digits than its factorization.

155720258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385248.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 155720258 is about 12478.7923293883. The cubic root of 155720258 is about 537.9992928963. Note that the first 3 decimals are identical.

The spelling of 155720258 in words is "one hundred fifty-five million, seven hundred twenty thousand, two hundred fifty-eight".