55378290 has 64 divisors (see below), whose sum is σ = 148563072. Its totient is φ = 13094400.

The previous prime is 55378283. The next prime is 55378291. The reversal of 55378290 is 9287355.

It is not an unprimeable number, because it can be changed into a prime (55378291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11484 + ... + 15576.

It is an arithmetic number, because the mean of its divisors is an integer number (2321298).

Almost surely, 2^55378290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55378290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74281536).

55378290 is an abundant number, since it is smaller than the sum of its proper divisors (93184782).

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

55378290 is a wasteful number, since it uses less digits than its factorization.

55378290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 55378290 is about 7441.6590892085. The cubic root of 55378290 is about 381.1651449600.

The spelling of 55378290 in words is "fifty-five million, three hundred seventy-eight thousand, two hundred ninety".