55742909 has 8 divisors (see below), whose sum is σ = 56931552. Its totient is φ = 54559440.

The previous prime is 55742899. The next prime is 55742917. The reversal of 55742909 is 90924755.

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

It is a cyclic number.

It is not a de Polignac number, because 55742909 - 2⁸ = 55742653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55702909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26714 + ... + 28724.

It is an arithmetic number, because the mean of its divisors is an integer number (7116444).

Almost surely, 2^55742909 is an apocalyptic number.

It is an amenable number.

55742909 is a deficient number, since it is larger than the sum of its proper divisors (1188643).

55742909 is a wasteful number, since it uses less digits than its factorization.

55742909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 55742909 is about 7466.1173979519. The cubic root of 55742909 is about 381.9998652266. Note that the first 3 decimals are identical.

The spelling of 55742909 in words is "fifty-five million, seven hundred forty-two thousand, nine hundred nine".