990641428670 has 32 divisors (see below), whose sum is σ = 1802937719808. Its totient is φ = 391880256768.

The previous prime is 990641428657. The next prime is 990641428739. The reversal of 990641428670 is 76824146099.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 848549 + ... + 1643568.

It is an arithmetic number, because the mean of its divisors is an integer number (56341803744).

Almost surely, 2^990641428670 is an apocalyptic number.

990641428670 is a deficient number, since it is larger than the sum of its proper divisors (812296291138).

990641428670 is a wasteful number, since it uses less digits than its factorization.

990641428670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492564.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 990641428670 in words is "nine hundred ninety billion, six hundred forty-one million, four hundred twenty-eight thousand, six hundred seventy".