155705472 has 192 divisors, whose sum is σ = 497329560. Its totient is φ = 46448640.

The previous prime is 155705471. The next prime is 155705479. The reversal of 155705472 is 274507551.

155705472 is a `hidden beast` number, since 15 + 570 + 5 + 4 + 72 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 144576576 + 11128896 = 12024^2 + 3336^2 .

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155705471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 553972 + ... + 554252.

Almost surely, 2^155705472 is an apocalyptic number.

155705472 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 155705472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248664780).

155705472 is an abundant number, since it is smaller than the sum of its proper divisors (341624088).

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

155705472 is a wasteful number, since it uses less digits than its factorization.

155705472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 336 counting only the distinct ones).

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

The square root of 155705472 is about 12478.1998701736. The cubic root of 155705472 is about 537.9822642633.

The spelling of 155705472 in words is "one hundred fifty-five million, seven hundred five thousand, four hundred seventy-two".