12640279990 has 64 divisors (see below), whose sum is σ = 24953515776. Its totient is φ = 4582023552.

The previous prime is 12640279973. The next prime is 12640279999. The reversal of 12640279990 is 9997204621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640279999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1755177 + ... + 1762363.

It is an arithmetic number, because the mean of its divisors is an integer number (389898684).

Almost surely, 2^12640279990 is an apocalyptic number.

12640279990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12640279990 is a deficient number, since it is larger than the sum of its proper divisors (12313235786).

12640279990 is a wasteful number, since it uses less digits than its factorization.

12640279990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7453.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 12640279990 in words is "twelve billion, six hundred forty million, two hundred seventy-nine thousand, nine hundred ninety".