1248639680 has 28 divisors (see below), whose sum is σ = 2973324000. Its totient is φ = 499455744.

The previous prime is 1248639673. The next prime is 1248639697. The reversal of 1248639680 is 869368421.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950680 + ... + 1951319.

Almost surely, 2^1248639680 is an apocalyptic number.

1248639680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1248639680 is an abundant number, since it is smaller than the sum of its proper divisors (1724684320).

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

1248639680 is an equidigital number, since it uses as much as digits as its factorization.

1248639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902016 (or 3902006 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 1248639680 is about 35336.0959926249. The cubic root of 1248639680 is about 1076.8264404339.

The spelling of 1248639680 in words is "one billion, two hundred forty-eight million, six hundred thirty-nine thousand, six hundred eighty".