155778768 has 80 divisors (see below), whose sum is σ = 449524800. Its totient is φ = 51649920.

The previous prime is 155778743. The next prime is 155778773. The reversal of 155778768 is 867877551.

It is a happy number.

155778768 is a `hidden beast` number, since 1 + 5 + 577 + 8 + 7 + 68 = 666.

155778768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90298 + ... + 92006.

It is an arithmetic number, because the mean of its divisors is an integer number (5619060).

Almost surely, 2^155778768 is an apocalyptic number.

155778768 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 155778768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224762400).

155778768 is an abundant number, since it is smaller than the sum of its proper divisors (293746032).

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

155778768 is a wasteful number, since it uses less digits than its factorization.

155778768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1925 counting only the distinct ones).

The product of its digits is 3292800, while the sum is 54.

The square root of 155778768 is about 12481.1364867147. The cubic root of 155778768 is about 538.0666666970.

The spelling of 155778768 in words is "one hundred fifty-five million, seven hundred seventy-eight thousand, seven hundred sixty-eight".