155220450 has 192 divisors, whose sum is σ = 488540160. Its totient is φ = 31680000.

The previous prime is 155220433. The next prime is 155220463. The reversal of 155220450 is 54022551.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155220450.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1027875 + ... + 1028025.

It is an arithmetic number, because the mean of its divisors is an integer number (2544480).

Almost surely, 2^155220450 is an apocalyptic number.

155220450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155220450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244270080).

155220450 is an abundant number, since it is smaller than the sum of its proper divisors (333319710).

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

155220450 is a wasteful number, since it uses less digits than its factorization.

155220450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 155220450 is about 12458.7499372931. The cubic root of 155220450 is about 537.4230789510.

The spelling of 155220450 in words is "one hundred fifty-five million, two hundred twenty thousand, four hundred fifty".