155778448 has 120 divisors (see below), whose sum is σ = 375565248. Its totient is φ = 62270208.

The previous prime is 155778439. The next prime is 155778449. The reversal of 155778448 is 844877551.

It is a super-2 number, since 2×155778448² = 48533849722577408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (155778449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 955615 + ... + 955777.

Almost surely, 2^155778448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155778448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187782624).

155778448 is an abundant number, since it is smaller than the sum of its proper divisors (219786800).

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

155778448 is a wasteful number, since it uses less digits than its factorization.

155778448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 248 counting only the distinct ones).

The product of its digits is 1254400, while the sum is 49.

The square root of 155778448 is about 12481.1236673626. The cubic root of 155778448 is about 538.0662982655.

It can be divided in two parts, 15577 and 8448, that added together give a square (24025 = 155²).

The spelling of 155778448 in words is "one hundred fifty-five million, seven hundred seventy-eight thousand, four hundred forty-eight".