1356781640 has 64 divisors (see below), whose sum is σ = 3238963200. Its totient is φ = 510064128.

The previous prime is 1356781627. The next prime is 1356781649. The reversal of 1356781640 is 461876531.

It is not an unprimeable number, because it can be changed into a prime (1356781649) 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, 89492 + ... + 103548.

It is an arithmetic number, because the mean of its divisors is an integer number (50608800).

Almost surely, 2^1356781640 is an apocalyptic number.

1356781640 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 1356781640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1619481600).

1356781640 is an abundant number, since it is smaller than the sum of its proper divisors (1882181560).

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

1356781640 is a wasteful number, since it uses less digits than its factorization.

1356781640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14214 (or 14210 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 1356781640 is about 36834.5169643909. The cubic root of 1356781640 is about 1107.0570093646.

The spelling of 1356781640 in words is "one billion, three hundred fifty-six million, seven hundred eighty-one thousand, six hundred forty".