445722640 has 80 divisors (see below), whose sum is σ = 1133695296. Its totient is φ = 161625600.

The previous prime is 445722637. The next prime is 445722679. The reversal of 445722640 is 46227544.

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

It is a junction number, because it is equal to n+sod(n) for n = 445722596 and 445722605.

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, 607714 + ... + 608446.

Almost surely, 2^445722640 is an apocalyptic number.

445722640 is a gapful number since it is divisible by the number (40) 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 445722640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (566847648).

445722640 is an abundant number, since it is smaller than the sum of its proper divisors (687972656).

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

445722640 is a wasteful number, since it uses less digits than its factorization.

445722640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 1442 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 445722640 is about 21112.1443723749. The cubic root of 445722640 is about 763.8737124850.

The spelling of 445722640 in words is "four hundred forty-five million, seven hundred twenty-two thousand, six hundred forty".