155408220 has 384 divisors, whose sum is σ = 595123200. Its totient is φ = 33592320.

The previous prime is 155408219. The next prime is 155408221. The reversal of 155408220 is 22804551.

It is a happy number.

155408220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155408219) and next prime (155408221).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155408221) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8179371 + ... + 8179389.

It is an arithmetic number, because the mean of its divisors is an integer number (1549800).

Almost surely, 2^155408220 is an apocalyptic number.

155408220 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 155408220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297561600).

155408220 is an abundant number, since it is smaller than the sum of its proper divisors (439714980).

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

155408220 is a wasteful number, since it uses less digits than its factorization.

155408220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 155408220 is about 12466.2833274397. The cubic root of 155408220 is about 537.6396983201.

The spelling of 155408220 in words is "one hundred fifty-five million, four hundred eight thousand, two hundred twenty".