642055777 has 8 divisors (see below), whose sum is σ = 717508512. Its totient is φ = 569450400.

The previous prime is 642055723. The next prime is 642055819. The reversal of 642055777 is 777550246.

642055777 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 a cyclic number.

It is not a de Polignac number, because 642055777 - 2¹¹ = 642053729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642055577) 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, 711363 + ... + 712264.

It is an arithmetic number, because the mean of its divisors is an integer number (89688564).

Almost surely, 2^642055777 is an apocalyptic number.

It is an amenable number.

642055777 is a deficient number, since it is larger than the sum of its proper divisors (75452735).

642055777 is a wasteful number, since it uses less digits than its factorization.

642055777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423679.

The product of its (nonzero) digits is 411600, while the sum is 43.

The square root of 642055777 is about 25338.8195660335. The cubic root of 642055777 is about 862.6956059048.

The spelling of 642055777 in words is "six hundred forty-two million, fifty-five thousand, seven hundred seventy-seven".