55391730 has 32 divisors (see below), whose sum is σ = 137230848. Its totient is φ = 14294400.

The previous prime is 55391723. The next prime is 55391741. The reversal of 55391730 is 3719355.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55391691 and 55391700.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28851 + ... + 30710.

It is an arithmetic number, because the mean of its divisors is an integer number (4288464).

Almost surely, 2^55391730 is an apocalyptic number.

55391730 is an abundant number, since it is smaller than the sum of its proper divisors (81839118).

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

55391730 is a wasteful number, since it uses less digits than its factorization.

55391730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59602.

The product of its (nonzero) digits is 14175, while the sum is 33.

The square root of 55391730 is about 7442.5620588612. The cubic root of 55391730 is about 381.1959780125.

The spelling of 55391730 in words is "fifty-five million, three hundred ninety-one thousand, seven hundred thirty".