55551730 has 32 divisors (see below), whose sum is σ = 108093888. Its totient is φ = 20433600.

The previous prime is 55551709. The next prime is 55551731. The reversal of 55551730 is 3715555.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 55551692 and 55551701.

It is not an unprimeable number, because it can be changed into a prime (55551731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42385 + ... + 43675.

It is an arithmetic number, because the mean of its divisors is an integer number (3377934).

Almost surely, 2^55551730 is an apocalyptic number.

55551730 is a deficient number, since it is larger than the sum of its proper divisors (52542158).

55551730 is a wasteful number, since it uses less digits than its factorization.

55551730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642.

The product of its (nonzero) digits is 13125, while the sum is 31.

The square root of 55551730 is about 7453.3032945131. The cubic root of 55551730 is about 381.5626556475.

The spelling of 55551730 in words is "fifty-five million, five hundred fifty-one thousand, seven hundred thirty".