55378158 has 48 divisors (see below), whose sum is σ = 126741888. Its totient is φ = 15967600.

The previous prime is 55378157. The next prime is 55378177. The reversal of 55378158 is 85187355.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55378157) 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, 289843 + ... + 290033.

It is an arithmetic number, because the mean of its divisors is an integer number (2640456).

Almost surely, 2^55378158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55378158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63370944).

55378158 is an abundant number, since it is smaller than the sum of its proper divisors (71363730).

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

55378158 is a wasteful number, since it uses less digits than its factorization.

55378158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 230 counting only the distinct ones).

The product of its digits is 168000, while the sum is 42.

The square root of 55378158 is about 7441.6502202133. The cubic root of 55378158 is about 381.1648421106.

It can be divided in two parts, 5537 and 8158, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 55378158 in words is "fifty-five million, three hundred seventy-eight thousand, one hundred fifty-eight".