9887439646 has 32 divisors (see below), whose sum is σ = 17660270592. Its totient is φ = 4062437280.

The previous prime is 9887439643. The next prime is 9887439671. The reversal of 9887439646 is 6469347889.

It is a super-2 number, since 2×9887439646² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9887439643) 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, 60021 + ... + 152896.

It is an arithmetic number, because the mean of its divisors is an integer number (551883456).

Almost surely, 2^9887439646 is an apocalyptic number.

9887439646 is a deficient number, since it is larger than the sum of its proper divisors (7772830946).

9887439646 is a wasteful number, since it uses less digits than its factorization.

9887439646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213064.

The product of its digits is 62705664, while the sum is 64.

The square root of 9887439646 is about 99435.6055243794. The cubic root of 9887439646 is about 2146.3207053042.

The spelling of 9887439646 in words is "nine billion, eight hundred eighty-seven million, four hundred thirty-nine thousand, six hundred forty-six".