55742781 has 8 divisors (see below), whose sum is σ = 74380864. Its totient is φ = 37133280.

The previous prime is 55742773. The next prime is 55742783. The reversal of 55742781 is 18724755.

55742781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55742781 - 2³ = 55742773 is a prime.

It is a super-2 number, since 2×55742781² = 6214515267227922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55742783) 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 7 ways as a sum of consecutive naturals, for example, 2080 + ... + 10761.

It is an arithmetic number, because the mean of its divisors is an integer number (9297608).

Almost surely, 2^55742781 is an apocalyptic number.

It is an amenable number.

55742781 is a deficient number, since it is larger than the sum of its proper divisors (18638083).

55742781 is a wasteful number, since it uses less digits than its factorization.

55742781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14291.

The product of its digits is 78400, while the sum is 39.

The square root of 55742781 is about 7466.1088258878. The cubic root of 55742781 is about 381.9995728365. Note that the first 3 decimals are identical.

The spelling of 55742781 in words is "fifty-five million, seven hundred forty-two thousand, seven hundred eighty-one".