155655720 has 192 divisors, whose sum is σ = 576201600. Its totient is φ = 36072960.

The previous prime is 155655691. The next prime is 155655727. The reversal of 155655720 is 27556551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (155655727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90226 + ... + 91934.

It is an arithmetic number, because the mean of its divisors is an integer number (3001050).

Almost surely, 2^155655720 is an apocalyptic number.

155655720 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 155655720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288100800).

155655720 is an abundant number, since it is smaller than the sum of its proper divisors (420545880).

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

155655720 is a wasteful number, since it uses less digits than its factorization.

155655720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The square root of 155655720 is about 12476.2061541159. The cubic root of 155655720 is about 537.9249583242.

The spelling of 155655720 in words is "one hundred fifty-five million, six hundred fifty-five thousand, seven hundred twenty".