642804655 has 8 divisors (see below), whose sum is σ = 771666192. Its totient is φ = 514043328.

The previous prime is 642804611. The next prime is 642804671. The reversal of 642804655 is 556408246.

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 642804655 - 2¹⁷ = 642673583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10129 + ... + 37258.

It is an arithmetic number, because the mean of its divisors is an integer number (96458274).

Almost surely, 2^642804655 is an apocalyptic number.

642804655 is a deficient number, since it is larger than the sum of its proper divisors (128861537).

642804655 is a wasteful number, since it uses less digits than its factorization.

642804655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50105.

The product of its (nonzero) digits is 230400, while the sum is 40.

The square root of 642804655 is about 25353.5925462251. The cubic root of 642804655 is about 863.0308845340.

The spelling of 642804655 in words is "six hundred forty-two million, eight hundred four thousand, six hundred fifty-five".