1366202640 has 80 divisors (see below), whose sum is σ = 4620257856. Its totient is φ = 331200000.

The previous prime is 1366202639. The next prime is 1366202647. The reversal of 1366202640 is 462026631.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1366202598 and 1366202607.

It is not an unprimeable number, because it can be changed into a prime (1366202647) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 256111 + ... + 261390.

Almost surely, 2^1366202640 is an apocalyptic number.

1366202640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1366202640 is an abundant number, since it is smaller than the sum of its proper divisors (3254055216).

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

1366202640 is a wasteful number, since it uses less digits than its factorization.

1366202640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517528 (or 517522 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1366202640 is about 36962.1785072255. The cubic root of 1366202640 is about 1109.6134357193.

The spelling of 1366202640 in words is "one billion, three hundred sixty-six million, two hundred two thousand, six hundred forty".