1326623640 has 64 divisors (see below), whose sum is σ = 4035951360. Its totient is φ = 348781440.

The previous prime is 1326623621. The next prime is 1326623663. The reversal of 1326623640 is 463266231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69334 + ... + 86373.

It is an arithmetic number, because the mean of its divisors is an integer number (63061740).

Almost surely, 2^1326623640 is an apocalyptic number.

1326623640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1326623640 is an abundant number, since it is smaller than the sum of its proper divisors (2709327720).

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

1326623640 is a wasteful number, since it uses less digits than its factorization.

1326623640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155792 (or 155788 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 1326623640 is about 36422.8450289101. The cubic root of 1326623640 is about 1098.7930674086.

Adding to 1326623640 its reverse (463266231), we get a palindrome (1789889871).

The spelling of 1326623640 in words is "one billion, three hundred twenty-six million, six hundred twenty-three thousand, six hundred forty".