642667277 has 8 divisors (see below), whose sum is σ = 734630400. Its totient is φ = 550742544.

The previous prime is 642667261. The next prime is 642667297. The reversal of 642667277 is 772766246.

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 642667277 - 2⁴ = 642667261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642667297) 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, 58724 + ... + 68802.

It is an arithmetic number, because the mean of its divisors is an integer number (91828800).

Almost surely, 2^642667277 is an apocalyptic number.

It is an amenable number.

642667277 is a deficient number, since it is larger than the sum of its proper divisors (91963123).

642667277 is a wasteful number, since it uses less digits than its factorization.

642667277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19195.

The product of its digits is 1185408, while the sum is 47.

The square root of 642667277 is about 25350.8831601583. The cubic root of 642667277 is about 862.9693988228.

The spelling of 642667277 in words is "six hundred forty-two million, six hundred sixty-seven thousand, two hundred seventy-seven".