155215872 has 192 divisors, whose sum is σ = 526780800. Its totient is φ = 44236800.

The previous prime is 155215829. The next prime is 155215877. The reversal of 155215872 is 278512551.

155215872 is a `hidden beast` number, since 1 + 55 + 21 + 587 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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 (155215877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386872 + ... + 387272.

It is an arithmetic number, because the mean of its divisors is an integer number (2743650).

Almost surely, 2^155215872 is an apocalyptic number.

155215872 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 155215872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263390400).

155215872 is an abundant number, since it is smaller than the sum of its proper divisors (371564928).

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

155215872 is an equidigital number, since it uses as much as digits as its factorization.

155215872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 413 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 155215872 is about 12458.5662096407. The cubic root of 155215872 is about 537.4177953966.

It can be divided in two parts, 1552 and 15872, that added together give a square (17424 = 132²).

The spelling of 155215872 in words is "one hundred fifty-five million, two hundred fifteen thousand, eight hundred seventy-two".