642871077 has 8 divisors (see below), whose sum is σ = 858802464. Its totient is φ = 427760208.

The previous prime is 642871067. The next prime is 642871109. The reversal of 642871077 is 770178246.

642871077 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 not a de Polignac number, because 642871077 - 2⁸ = 642870821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642871067) 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, 203298 + ... + 206435.

It is an arithmetic number, because the mean of its divisors is an integer number (107350308).

Almost surely, 2^642871077 is an apocalyptic number.

It is an amenable number.

642871077 is a deficient number, since it is larger than the sum of its proper divisors (215931387).

642871077 is a wasteful number, since it uses less digits than its factorization.

642871077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410259.

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 642871077 is about 25354.9024253693. The cubic root of 642871077 is about 863.0606096159.

The spelling of 642871077 in words is "six hundred forty-two million, eight hundred seventy-one thousand, seventy-seven".