55378730 has 32 divisors (see below), whose sum is σ = 114471360. Its totient is φ = 19077120.

The previous prime is 55378723. The next prime is 55378747. The reversal of 55378730 is 3787355.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11159 + ... + 15338.

It is an arithmetic number, because the mean of its divisors is an integer number (3577230).

Almost surely, 2^55378730 is an apocalyptic number.

55378730 is an abundant number, since it is smaller than the sum of its proper divisors (59092630).

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

55378730 is a wasteful number, since it uses less digits than its factorization.

55378730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26534.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 55378730 is about 7441.6886524498. The cubic root of 55378730 is about 381.1661544544.

It can be divided in two parts, 5 and 5378730, that added together give a palindrome (5378735).

The spelling of 55378730 in words is "fifty-five million, three hundred seventy-eight thousand, seven hundred thirty".