881665407 has 48 divisors (see below), whose sum is σ = 1546601472. Its totient is φ = 472469760.

The previous prime is 881665397. The next prime is 881665427. The reversal of 881665407 is 704566188.

It is a happy number.

881665407 is a `hidden beast` number, since 88 + 166 + 5 + 407 = 666.

It is not a de Polignac number, because 881665407 - 2¹⁰ = 881664383 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881665427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 331758 + ... + 334404.

It is an arithmetic number, because the mean of its divisors is an integer number (32220864).

Almost surely, 2^881665407 is an apocalyptic number.

881665407 is a deficient number, since it is larger than the sum of its proper divisors (664936065).

881665407 is a wasteful number, since it uses less digits than its factorization.

881665407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988 (or 2985 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 881665407 is about 29692.8511093159. The cubic root of 881665407 is about 958.8881104729. Note that the first 3 decimals are identical.

The spelling of 881665407 in words is "eight hundred eighty-one million, six hundred sixty-five thousand, four hundred seven".