155481864 has 128 divisors (see below), whose sum is σ = 447897600. Its totient is φ = 44651520.

The previous prime is 155481857. The next prime is 155481869. The reversal of 155481864 is 468184551.

It is a super-2 number, since 2×155481864² = 48349220065828992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155481869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239989 + ... + 240635.

It is an arithmetic number, because the mean of its divisors is an integer number (3499200).

Almost surely, 2^155481864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155481864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223948800).

155481864 is an abundant number, since it is smaller than the sum of its proper divisors (292415736).

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

155481864 is a wasteful number, since it uses less digits than its factorization.

155481864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 719 counting only the distinct ones).

The product of its digits is 153600, while the sum is 42.

The square root of 155481864 is about 12469.2367047867. The cubic root of 155481864 is about 537.7246094987.

The spelling of 155481864 in words is "one hundred fifty-five million, four hundred eighty-one thousand, eight hundred sixty-four".