642306777 has 8 divisors (see below), whose sum is σ = 978753216. Its totient is φ = 367032432.

The previous prime is 642306727. The next prime is 642306787. The reversal of 642306777 is 777603246.

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

It is not a de Polignac number, because 642306777 - 2⁸ = 642306521 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (642306727) 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, 15292998 + ... + 15293039.

It is an arithmetic number, because the mean of its divisors is an integer number (122344152).

Almost surely, 2^642306777 is an apocalyptic number.

It is an amenable number.

642306777 is a deficient number, since it is larger than the sum of its proper divisors (336446439).

642306777 is a wasteful number, since it uses less digits than its factorization.

642306777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30586047.

The product of its (nonzero) digits is 296352, while the sum is 42.

The square root of 642306777 is about 25343.7719568339. The cubic root of 642306777 is about 862.8080096315.

The spelling of 642306777 in words is "six hundred forty-two million, three hundred six thousand, seven hundred seventy-seven".