445720728402 has 20 divisors (see below), whose sum is σ = 998744595486. Its totient is φ = 148573576080.

The previous prime is 445720728377. The next prime is 445720728413. The reversal of 445720728402 is 204827027544.

445720728402 is a `hidden beast` number, since 4 + 4 + 572 + 0 + 72 + 8 + 4 + 0 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 254551529961 + 191169198441 = 504531^2 + 437229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1375681099 + ... + 1375681422.

Almost surely, 2^445720728402 is an apocalyptic number.

445720728402 is an abundant number, since it is smaller than the sum of its proper divisors (553023867084).

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

445720728402 is a wasteful number, since it uses less digits than its factorization.

445720728402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751362535 (or 2751362526 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 45.

The spelling of 445720728402 in words is "four hundred forty-five billion, seven hundred twenty million, seven hundred twenty-eight thousand, four hundred two".