55555440 has 40 divisors (see below), whose sum is σ = 172222608. Its totient is φ = 14814720.

The previous prime is 55555429. The next prime is 55555459. The reversal of 55555440 is 4455555.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115501 + ... + 115980.

Almost surely, 2^55555440 is an apocalyptic number.

It is an amenable number.

55555440 is an abundant number, since it is smaller than the sum of its proper divisors (116667168).

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

55555440 is a wasteful number, since it uses less digits than its factorization.

55555440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231497 (or 231491 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 33.

The square root of 55555440 is about 7453.5521732929. The cubic root of 55555440 is about 381.5711496281.

The spelling of 55555440 in words is "fifty-five million, five hundred fifty-five thousand, four hundred forty".