155440320 has 112 divisors (see below), whose sum is σ = 564050688. Its totient is φ = 35527680.

The previous prime is 155440303. The next prime is 155440331. The reversal of 155440320 is 23044551.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4846 + ... + 18285.

Almost surely, 2^155440320 is an apocalyptic number.

155440320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282025344).

155440320 is an abundant number, since it is smaller than the sum of its proper divisors (408610368).

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

155440320 is a wasteful number, since it uses less digits than its factorization.

155440320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23158 (or 23148 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 155440320 is about 12467.5707337075. The cubic root of 155440320 is about 537.6767127633.

Adding to 155440320 its reverse (23044551), we get a palindrome (178484871).

The spelling of 155440320 in words is "one hundred fifty-five million, four hundred forty thousand, three hundred twenty".