55439090 has 40 divisors (see below), whose sum is σ = 116465580. Its totient is φ = 18999456.

The previous prime is 55439081. The next prime is 55439101. The reversal of 55439090 is 9093455.

It can be written as a sum of positive squares in 2 ways, for example, as 54745201 + 693889 = 7399^2 + 833^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55439090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22856 + ... + 25164.

Almost surely, 2^55439090 is an apocalyptic number.

55439090 is an abundant number, since it is smaller than the sum of its proper divisors (61026490).

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

55439090 is an equidigital number, since it uses as much as digits as its factorization.

55439090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 55439090 is about 7445.7430791023. The cubic root of 55439090 is about 381.3045880808.

The spelling of 55439090 in words is "fifty-five million, four hundred thirty-nine thousand, ninety".