155378550 has 48 divisors (see below), whose sum is σ = 388202832. Its totient is φ = 41126400.

The previous prime is 155378539. The next prime is 155378551. The reversal of 155378550 is 55873551.

155378550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155378499 and 155378508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155378551) 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, 16770 + ... + 24330.

It is an arithmetic number, because the mean of its divisors is an integer number (8087559).

Almost surely, 2^155378550 is an apocalyptic number.

155378550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155378550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194101416).

155378550 is an abundant number, since it is smaller than the sum of its proper divisors (232824282).

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

155378550 is a wasteful number, since it uses less digits than its factorization.

155378550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713 (or 7708 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The square root of 155378550 is about 12465.0932607823. The cubic root of 155378550 is about 537.6054813717.

The spelling of 155378550 in words is "one hundred fifty-five million, three hundred seventy-eight thousand, five hundred fifty".