55345290 has 256 divisors, whose sum is σ = 189665280. Its totient is φ = 9953280.

The previous prime is 55345289. The next prime is 55345331. The reversal of 55345290 is 9254355.

It is a super-2 number, since 2×55345290² = 6126202250368200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 570522 + ... + 570618.

It is an arithmetic number, because the mean of its divisors is an integer number (740880).

Almost surely, 2^55345290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55345290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94832640).

55345290 is an abundant number, since it is smaller than the sum of its proper divisors (134319990).

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

55345290 is a wasteful number, since it uses less digits than its factorization.

55345290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 55345290 is about 7439.4415112964. The cubic root of 55345290 is about 381.0894176361.

The spelling of 55345290 in words is "fifty-five million, three hundred forty-five thousand, two hundred ninety".