1322073640 has 64 divisors (see below), whose sum is σ = 3089696400. Its totient is φ = 508704768.

The previous prime is 1322073617. The next prime is 1322073661. The reversal of 1322073640 is 463702231.

It can be written as a sum of positive squares in 8 ways, for example, as 537961636 + 784112004 = 23194^2 + 28002^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1322073599 and 1322073608.

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, 126702 + ... + 136738.

Almost surely, 2^1322073640 is an apocalyptic number.

1322073640 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 1322073640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544848200).

1322073640 is an abundant number, since it is smaller than the sum of its proper divisors (1767622760).

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

1322073640 is a wasteful number, since it uses less digits than its factorization.

1322073640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10174 (or 10170 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 1322073640 is about 36360.3305815555. The cubic root of 1322073640 is about 1097.5354298679.

Adding to 1322073640 its reverse (463702231), we get a palindrome (1785775871).

The spelling of 1322073640 in words is "one billion, three hundred twenty-two million, seventy-three thousand, six hundred forty".