55781033 has 16 divisors (see below), whose sum is σ = 71245440. Its totient is φ = 42403200.

The previous prime is 55781009. The next prime is 55781071. The reversal of 55781033 is 33018755.

55781033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55781033 - 2¹⁴ = 55764649 is a prime.

It is a super-2 number, since 2×55781033² = 6223047285094178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55781083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5678 + ... + 11991.

It is an arithmetic number, because the mean of its divisors is an integer number (4452840).

Almost surely, 2^55781033 is an apocalyptic number.

It is an amenable number.

55781033 is a deficient number, since it is larger than the sum of its proper divisors (15464407).

55781033 is a wasteful number, since it uses less digits than its factorization.

55781033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17728.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 55781033 is about 7468.6700958069. The cubic root of 55781033 is about 382.0869318706.

Adding to 55781033 its reverse (33018755), we get a palindrome (88799788).

The spelling of 55781033 in words is "fifty-five million, seven hundred eighty-one thousand, thirty-three".