55163730 has 16 divisors (see below), whose sum is σ = 132393024. Its totient is φ = 14710320.

The previous prime is 55163699. The next prime is 55163749. The reversal of 55163730 is 3736155.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1838791 = 55163730 / (5 + 5 + 1 + 6 + 3 + 7 + 3 + 0).

It is a Curzon 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, 919366 + ... + 919425.

It is an arithmetic number, because the mean of its divisors is an integer number (8274564).

Almost surely, 2^55163730 is an apocalyptic number.

55163730 is an abundant number, since it is smaller than the sum of its proper divisors (77229294).

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

55163730 is a wasteful number, since it uses less digits than its factorization.

55163730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838801.

The product of its (nonzero) digits is 9450, while the sum is 30.

The square root of 55163730 is about 7427.2289583666. The cubic root of 55163730 is about 380.6722403558.

Adding to 55163730 its reverse (3736155), we get a palindrome (58899885).

The spelling of 55163730 in words is "fifty-five million, one hundred sixty-three thousand, seven hundred thirty".