242666646 has 64 divisors (see below), whose sum is σ = 514805760. Its totient is φ = 76170240.

The previous prime is 242666621. The next prime is 242666657. The reversal of 242666646 is 646666242.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 242666598 and 242666607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1270411 + ... + 1270601.

It is an arithmetic number, because the mean of its divisors is an integer number (8043840).

Almost surely, 2^242666646 is an apocalyptic number.

242666646 is an abundant number, since it is smaller than the sum of its proper divisors (272139114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

242666646 is a wasteful number, since it uses less digits than its factorization.

242666646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389.

The product of its digits is 497664, while the sum is 42.

The square root of 242666646 is about 15577.7612640585. The cubic root of 242666646 is about 623.7396647832.

The spelling of 242666646 in words is "two hundred forty-two million, six hundred sixty-six thousand, six hundred forty-six".