639697034 has 8 divisors (see below), whose sum is σ = 969046308. Its totient is φ = 316681600.

The previous prime is 639697031. The next prime is 639697099. The reversal of 639697034 is 430796936.

It can be written as a sum of positive squares in 2 ways, for example, as 563920009 + 75777025 = 23747^2 + 8705^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 639697034.

It is not an unprimeable number, because it can be changed into a prime (639697031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1583207 + ... + 1583610.

Almost surely, 2^639697034 is an apocalyptic number.

639697034 is a deficient number, since it is larger than the sum of its proper divisors (329349274).

639697034 is a wasteful number, since it uses less digits than its factorization.

639697034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166920.

The product of its (nonzero) digits is 734832, while the sum is 47.

The square root of 639697034 is about 25292.2326812008. The cubic root of 639697034 is about 861.6378711204.

The spelling of 639697034 in words is "six hundred thirty-nine million, six hundred ninety-seven thousand, thirty-four".