155720448 has 144 divisors (see below), whose sum is σ = 496201440. Its totient is φ = 47886336.

The previous prime is 155720443. The next prime is 155720473. The reversal of 155720448 is 844027551.

It is a tau number, because it is divible by the number of its divisors (144).

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 (155720443) 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, 88990 + ... + 90722.

Almost surely, 2^155720448 is an apocalyptic number.

155720448 is a gapful number since it is divisible by the number (18) 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 155720448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248100720).

155720448 is an abundant number, since it is smaller than the sum of its proper divisors (340480992).

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

155720448 is a wasteful number, since it uses less digits than its factorization.

155720448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 155720448 is about 12478.7999423021. The cubic root of 155720448 is about 537.9995117071. Note that the first 3 decimals are identical.

Adding to 155720448 its reverse (844027551), we get a palindrome (999747999).

The spelling of 155720448 in words is "one hundred fifty-five million, seven hundred twenty thousand, four hundred forty-eight".