445721887 has 16 divisors (see below), whose sum is σ = 487060000. Its totient is φ = 405430272.

The previous prime is 445721873. The next prime is 445721897. The reversal of 445721887 is 788127544.

It is not a de Polignac number, because 445721887 - 2¹¹ = 445719839 is a prime.

It is a super-3 number, since 3×445721887³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445721897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356239 + ... + 357487.

It is an arithmetic number, because the mean of its divisors is an integer number (30441250).

Almost surely, 2^445721887 is an apocalyptic number.

445721887 is a deficient number, since it is larger than the sum of its proper divisors (41338113).

445721887 is a wasteful number, since it uses less digits than its factorization.

445721887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642.

The product of its digits is 501760, while the sum is 46.

The square root of 445721887 is about 21112.1265390296. The cubic root of 445721887 is about 763.8732823242.

The spelling of 445721887 in words is "four hundred forty-five million, seven hundred twenty-one thousand, eight hundred eighty-seven".