155258478 has 64 divisors (see below), whose sum is σ = 358963200. Its totient is φ = 49688640.

The previous prime is 155258473. The next prime is 155258479. The reversal of 155258478 is 874852551.

155258478 is a `hidden beast` number, since 1 + 552 + 58 + 47 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155258471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 272578 + ... + 273146.

It is an arithmetic number, because the mean of its divisors is an integer number (5608800).

Almost surely, 2^155258478 is an apocalyptic number.

155258478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155258478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179481600).

155258478 is an abundant number, since it is smaller than the sum of its proper divisors (203704722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155258478 is a wasteful number, since it uses less digits than its factorization.

155258478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 768 counting only the distinct ones).

The product of its digits is 448000, while the sum is 45.

The square root of 155258478 is about 12460.2760001534. The cubic root of 155258478 is about 537.4669637528.

The spelling of 155258478 in words is "one hundred fifty-five million, two hundred fifty-eight thousand, four hundred seventy-eight".