1340062640 has 80 divisors (see below), whose sum is σ = 3619202880. Its totient is φ = 451906560.

The previous prime is 1340062631. The next prime is 1340062643. The reversal of 1340062640 is 462600431.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1340062643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14546 + ... + 53774.

It is an arithmetic number, because the mean of its divisors is an integer number (45240036).

Almost surely, 2^1340062640 is an apocalyptic number.

1340062640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1340062640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809601440).

1340062640 is an abundant number, since it is smaller than the sum of its proper divisors (2279140240).

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

1340062640 is a wasteful number, since it uses less digits than its factorization.

1340062640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39310 (or 39304 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1340062640 is about 36606.8660226466. The cubic root of 1340062640 is about 1102.4909500271.

The spelling of 1340062640 in words is "one billion, three hundred forty million, sixty-two thousand, six hundred forty".