1988316647 has 8 divisors (see below), whose sum is σ = 2059730400. Its totient is φ = 1917093024.

The previous prime is 1988316641. The next prime is 1988316653. The reversal of 1988316647 is 7466138891.

It is an interprime number because it is at equal distance from previous prime (1988316641) and next prime (1988316653).

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

It is a de Polignac number, because none of the positive numbers 2^k-1988316647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988316641) 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, 26072 + ... + 68237.

It is an arithmetic number, because the mean of its divisors is an integer number (257466300).

Almost surely, 2^1988316647 is an apocalyptic number.

1988316647 is a deficient number, since it is larger than the sum of its proper divisors (71413753).

1988316647 is an equidigital number, since it uses as much as digits as its factorization.

1988316647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95065.

The product of its digits is 1741824, while the sum is 53.

The square root of 1988316647 is about 44590.5443676123. The cubic root of 1988316647 is about 1257.4629067075.

The spelling of 1988316647 in words is "one billion, nine hundred eighty-eight million, three hundred sixteen thousand, six hundred forty-seven".