55781829 has 24 divisors (see below), whose sum is σ = 83466240. Its totient is φ = 35870688.

The previous prime is 55781783. The next prime is 55781833. The reversal of 55781829 is 92818755.

It is a happy number.

55781829 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 55781829 - 2⁹ = 55781317 is a prime.

It is a super-2 number, since 2×55781829² = 6223224893170482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55781839) 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 23 ways as a sum of consecutive naturals, for example, 41632 + ... + 42950.

It is an arithmetic number, because the mean of its divisors is an integer number (3477760).

Almost surely, 2^55781829 is an apocalyptic number.

It is an amenable number.

55781829 is a deficient number, since it is larger than the sum of its proper divisors (27684411).

55781829 is a wasteful number, since it uses less digits than its factorization.

55781829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489 (or 1486 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 55781829 is about 7468.7233848898. The cubic root of 55781829 is about 382.0887493327.

The spelling of 55781829 in words is "fifty-five million, seven hundred eighty-one thousand, eight hundred twenty-nine".