242778557 has 8 divisors (see below), whose sum is σ = 279164736. Its totient is φ = 206818272.

The previous prime is 242778553. The next prime is 242778563. The reversal of 242778557 is 755877242.

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 242778557 - 2² = 242778553 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 (242778553) 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, 105248 + ... + 107529.

It is an arithmetic number, because the mean of its divisors is an integer number (34895592).

Almost surely, 2^242778557 is an apocalyptic number.

It is an amenable number.

242778557 is a deficient number, since it is larger than the sum of its proper divisors (36386179).

242778557 is a wasteful number, since it uses less digits than its factorization.

242778557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212947.

The product of its digits is 1097600, while the sum is 47.

The square root of 242778557 is about 15581.3528616741. The cubic root of 242778557 is about 623.8355337501.

The spelling of 242778557 in words is "two hundred forty-two million, seven hundred seventy-eight thousand, five hundred fifty-seven".