155550720 has 352 divisors, whose sum is σ = 577745280. Its totient is φ = 35389440.

The previous prime is 155550673. The next prime is 155550721. The reversal of 155550720 is 27055551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (155550721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3793900 + ... + 3793940.

Almost surely, 2^155550720 is an apocalyptic number.

155550720 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 155550720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288872640).

155550720 is an abundant number, since it is smaller than the sum of its proper divisors (422194560).

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

155550720 is a wasteful number, since it uses less digits than its factorization.

155550720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 8750, while the sum is 30.

The square root of 155550720 is about 12471.9974342525. The cubic root of 155550720 is about 537.8039758858.

The spelling of 155550720 in words is "one hundred fifty-five million, five hundred fifty thousand, seven hundred twenty".