639463771 has 8 divisors (see below), whose sum is σ = 650744640. Its totient is φ = 628197768.

The previous prime is 639463739. The next prime is 639463777. The reversal of 639463771 is 177364936.

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 639463771 - 2⁵ = 639463739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639463777) 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, 116920 + ... + 122266.

It is an arithmetic number, because the mean of its divisors is an integer number (81343080).

Almost surely, 2^639463771 is an apocalyptic number.

639463771 is a deficient number, since it is larger than the sum of its proper divisors (11280869).

639463771 is a wasteful number, since it uses less digits than its factorization.

639463771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433.

The product of its digits is 571536, while the sum is 46.

The square root of 639463771 is about 25287.6209043081. The cubic root of 639463771 is about 861.5331274377.

The spelling of 639463771 in words is "six hundred thirty-nine million, four hundred sixty-three thousand, seven hundred seventy-one".