990641428671 has 8 divisors (see below), whose sum is σ = 1320872914944. Its totient is φ = 660418780760.

The previous prime is 990641428657. The next prime is 990641428739. The reversal of 990641428671 is 176824146099.

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

It is a cyclic number.

It is not a de Polignac number, because 990641428671 - 2¹⁸ = 990641166527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990641428631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943481 + ... + 2399666.

It is an arithmetic number, because the mean of its divisors is an integer number (165109114368).

Almost surely, 2^990641428671 is an apocalyptic number.

990641428671 is a deficient number, since it is larger than the sum of its proper divisors (330231486273).

990641428671 is a wasteful number, since it uses less digits than its factorization.

990641428671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419181.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 990641428671 in words is "nine hundred ninety billion, six hundred forty-one million, four hundred twenty-eight thousand, six hundred seventy-one".