55079781 has 8 divisors (see below), whose sum is σ = 73509600. Its totient is φ = 36684912.

The previous prime is 55079753. The next prime is 55079807. The reversal of 55079781 is 18797055.

55079781 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 55079781 - 2⁵ = 55079749 is a prime.

It is a super-2 number, since 2×55079781² = 6067564550015922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55079581) 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, 4806 + ... + 11543.

It is an arithmetic number, because the mean of its divisors is an integer number (9188700).

Almost surely, 2^55079781 is an apocalyptic number.

It is an amenable number.

55079781 is a deficient number, since it is larger than the sum of its proper divisors (18429819).

55079781 is a wasteful number, since it uses less digits than its factorization.

55079781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17475.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 55079781 is about 7421.5753718466. The cubic root of 55079781 is about 380.4790380558.

The spelling of 55079781 in words is "fifty-five million, seventy-nine thousand, seven hundred eighty-one".