989995645 has 8 divisors (see below), whose sum is σ = 1188565560. Its totient is φ = 791616000.

The previous prime is 989995631. The next prime is 989995651. The reversal of 989995645 is 546599989.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 141205689 + 848789956 = 11883^2 + 29134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 989995645 - 2¹¹ = 989993597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35856 + ... + 57145.

It is an arithmetic number, because the mean of its divisors is an integer number (148570695).

Almost surely, 2^989995645 is an apocalyptic number.

It is an amenable number.

989995645 is a deficient number, since it is larger than the sum of its proper divisors (198569915).

989995645 is a wasteful number, since it uses less digits than its factorization.

989995645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95135.

The product of its digits is 31492800, while the sum is 64.

The square root of 989995645 is about 31464.1962395355. The cubic root of 989995645 is about 996.6540319846.

The spelling of 989995645 in words is "nine hundred eighty-nine million, nine hundred ninety-five thousand, six hundred forty-five".