8391387764 has 6 divisors (see below), whose sum is σ = 14684928594. Its totient is φ = 4195693880.

The previous prime is 8391387757. The next prime is 8391387773. The reversal of 8391387764 is 4677831938.

It can be written as a sum of positive squares in only one way, i.e., 8035688164 + 355699600 = 89642^2 + 18860^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1048923467 + ... + 1048923474.

It is an arithmetic number, because the mean of its divisors is an integer number (2447488099).

Almost surely, 2^8391387764 is an apocalyptic number.

It is an amenable number.

8391387764 is a deficient number, since it is larger than the sum of its proper divisors (6293540830).

8391387764 is a wasteful number, since it uses less digits than its factorization.

8391387764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097846945 (or 2097846943 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 56.

The square root of 8391387764 is about 91604.5182510121. The cubic root of 8391387764 is about 2032.0977581903.

The spelling of 8391387764 in words is "eight billion, three hundred ninety-one million, three hundred eighty-seven thousand, seven hundred sixty-four".