640847027 has 4 divisors (see below), whose sum is σ = 650411976. Its totient is φ = 631282080.

The previous prime is 640847023. The next prime is 640847041. The reversal of 640847027 is 720748046.

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

It is a cyclic number.

It is not a de Polignac number, because 640847027 - 2² = 640847023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640847023) 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, 4782374 + ... + 4782507.

It is an arithmetic number, because the mean of its divisors is an integer number (162602994).

Almost surely, 2^640847027 is an apocalyptic number.

640847027 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

640847027 is a deficient number, since it is larger than the sum of its proper divisors (9564949).

640847027 is an equidigital number, since it uses as much as digits as its factorization.

640847027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9564948.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 640847027 is about 25314.9565869665. The cubic root of 640847027 is about 862.1538884891.

It can be divided in two parts, 6408 and 47027, that added together give a palindrome (53435).

The spelling of 640847027 in words is "six hundred forty million, eight hundred forty-seven thousand, twenty-seven".