1445644020 has 48 divisors (see below), whose sum is σ = 4157209728. Its totient is φ = 375085440.

The previous prime is 1445644009. The next prime is 1445644033. The reversal of 1445644020 is 204465441.

It is a happy number.

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

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, 323376 + ... + 327815.

It is an arithmetic number, because the mean of its divisors is an integer number (86608536).

Almost surely, 2^1445644020 is an apocalyptic number.

1445644020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1445644020 is an abundant number, since it is smaller than the sum of its proper divisors (2711565708).

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

1445644020 is a wasteful number, since it uses less digits than its factorization.

1445644020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651240 (or 651238 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 1445644020 is about 38021.6256885473. The cubic root of 1445644020 is about 1130.7166519336.

The spelling of 1445644020 in words is "one billion, four hundred forty-five million, six hundred forty-four thousand, twenty".