155572272 has 80 divisors (see below), whose sum is σ = 458666080. Its totient is φ = 50450688.

The previous prime is 155572259. The next prime is 155572283. The reversal of 155572272 is 272275551.

155572272 is a `hidden beast` number, since 15 + 5 + 572 + 2 + 72 = 666.

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

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, 11118 + ... + 20850.

It is an arithmetic number, because the mean of its divisors is an integer number (5733326).

Almost surely, 2^155572272 is an apocalyptic number.

155572272 is a gapful number since it is divisible by the number (12) 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 155572272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229333040).

155572272 is an abundant number, since it is smaller than the sum of its proper divisors (303093808).

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

155572272 is a wasteful number, since it uses less digits than its factorization.

155572272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9787 (or 9775 counting only the distinct ones).

The product of its digits is 49000, while the sum is 36.

The square root of 155572272 is about 12472.8614198988. The cubic root of 155572272 is about 537.8288128350.

The spelling of 155572272 in words is "one hundred fifty-five million, five hundred seventy-two thousand, two hundred seventy-two".