640486047 has 4 divisors (see below), whose sum is σ = 853981400. Its totient is φ = 426990696.

The previous prime is 640486043. The next prime is 640486073. The reversal of 640486047 is 740684046.

640486047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 640486047 - 2² = 640486043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640485996 and 640486014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640486043) 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, 106747672 + ... + 106747677.

It is an arithmetic number, because the mean of its divisors is an integer number (213495350).

Almost surely, 2^640486047 is an apocalyptic number.

640486047 is a deficient number, since it is larger than the sum of its proper divisors (213495353).

640486047 is a wasteful number, since it uses less digits than its factorization.

640486047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213495352.

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 640486047 is about 25307.8258054697. The cubic root of 640486047 is about 861.9919784174.

The spelling of 640486047 in words is "six hundred forty million, four hundred eighty-six thousand, forty-seven".