55688290 has 32 divisors (see below), whose sum is σ = 119543040. Its totient is φ = 18262464.

The previous prime is 55688287. The next prime is 55688309. The reversal of 55688290 is 9288655.

55688290 = T₅₀ + T₅₁ + ... + T₆₉₃.

55688290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15685 + ... + 18904.

It is an arithmetic number, because the mean of its divisors is an integer number (3735720).

Almost surely, 2^55688290 is an apocalyptic number.

55688290 is an abundant number, since it is smaller than the sum of its proper divisors (63854750).

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

55688290 is a wasteful number, since it uses less digits than its factorization.

55688290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34626.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 55688290 is about 7462.4587101035. The cubic root of 55688290 is about 381.8750585064.

The spelling of 55688290 in words is "fifty-five million, six hundred eighty-eight thousand, two hundred ninety".