55395840 has 80 divisors (see below), whose sum is σ = 177118128. Its totient is φ = 14770176.

The previous prime is 55395817. The next prime is 55395841. The reversal of 55395840 is 4859355.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55395841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4074 + ... + 11286.

Almost surely, 2^55395840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55395840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88559064).

55395840 is an abundant number, since it is smaller than the sum of its proper divisors (121722288).

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

55395840 is an equidigital number, since it uses as much as digits as its factorization.

55395840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7239 (or 7223 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The square root of 55395840 is about 7442.8381683334. The cubic root of 55395840 is about 381.2054058743.

The spelling of 55395840 in words is "fifty-five million, three hundred ninety-five thousand, eight hundred forty".