1248987864 has 16 divisors (see below), whose sum is σ = 3122469720. Its totient is φ = 416329280.

The previous prime is 1248987853. The next prime is 1248987899. The reversal of 1248987864 is 4687898421.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26020557 + ... + 26020604.

Almost surely, 2^1248987864 is an apocalyptic number.

It is an amenable number.

1248987864 is an abundant number, since it is smaller than the sum of its proper divisors (1873481856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1248987864 is a wasteful number, since it uses less digits than its factorization.

1248987864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52041170 (or 52041166 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 57.

The square root of 1248987864 is about 35341.0223960768. The cubic root of 1248987864 is about 1076.9265223867.

The spelling of 1248987864 in words is "one billion, two hundred forty-eight million, nine hundred eighty-seven thousand, eight hundred sixty-four".