3865445280 has 96 divisors (see below), whose sum is σ = 13529073600. Its totient is φ = 1030784256.

The previous prime is 3865445249. The next prime is 3865445323. The reversal of 3865445280 is 825445683.

3865445280 is a `hidden beast` number, since 3 + 86 + 5 + 44 + 528 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443070 + ... + 451709.

It is an arithmetic number, because the mean of its divisors is an integer number (140927850).

Almost surely, 2^3865445280 is an apocalyptic number.

3865445280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3865445280 is an abundant number, since it is smaller than the sum of its proper divisors (9663628320).

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

3865445280 is a wasteful number, since it uses less digits than its factorization.

3865445280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894803 (or 894789 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The square root of 3865445280 is about 62172.7052652529. The cubic root of 3865445280 is about 1569.3982953967.

The spelling of 3865445280 in words is "three billion, eight hundred sixty-five million, four hundred forty-five thousand, two hundred eighty".