55172830 has 16 divisors (see below), whose sum is σ = 101424960. Its totient is φ = 21599392.

The previous prime is 55172813. The next prime is 55172851. The reversal of 55172830 is 3827155.

It is a junction number, because it is equal to n+sod(n) for n = 55172792 and 55172801.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 58225 + ... + 59164.

It is an arithmetic number, because the mean of its divisors is an integer number (6339060).

Almost surely, 2^55172830 is an apocalyptic number.

55172830 is a deficient number, since it is larger than the sum of its proper divisors (46252130).

55172830 is a wasteful number, since it uses less digits than its factorization.

55172830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117443.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55172830 is about 7427.8415438134. The cubic root of 55172830 is about 380.6931715420.

Adding to 55172830 its reverse (3827155), we get a palindrome (58999985).

The spelling of 55172830 in words is "fifty-five million, one hundred seventy-two thousand, eight hundred thirty".