1325644920 has 128 divisors (see below), whose sum is σ = 4459752000. Its totient is φ = 350231040.

The previous prime is 1325644913. The next prime is 1325644927. The reversal of 1325644920 is 294465231.

It is a happy number.

1325644920 is a `hidden beast` number, since 1 + 3 + 2 + 5 + 644 + 9 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1325644913) and next prime (1325644927).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325644927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112090 + ... + 123350.

Almost surely, 2^1325644920 is an apocalyptic number.

1325644920 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 1325644920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2229876000).

1325644920 is an abundant number, since it is smaller than the sum of its proper divisors (3134107080).

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

1325644920 is a wasteful number, since it uses less digits than its factorization.

1325644920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11390 (or 11380 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1325644920 is about 36409.4070262068. The cubic root of 1325644920 is about 1098.5227884616.

The spelling of 1325644920 in words is "one billion, three hundred twenty-five million, six hundred forty-four thousand, nine hundred twenty".