990681128654 has 32 divisors (see below), whose sum is σ = 1707228334080. Its totient is φ = 422353771488.

The previous prime is 990681128621. The next prime is 990681128663. The reversal of 990681128654 is 456821186099.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 990681128593 and 990681128602.

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, 1892789 + ... + 2358815.

It is an arithmetic number, because the mean of its divisors is an integer number (53350885440).

Almost surely, 2^990681128654 is an apocalyptic number.

990681128654 is a deficient number, since it is larger than the sum of its proper divisors (716547205426).

990681128654 is a wasteful number, since it uses less digits than its factorization.

990681128654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466832.

The product of its (nonzero) digits is 7464960, while the sum is 59.

The spelling of 990681128654 in words is "nine hundred ninety billion, six hundred eighty-one million, one hundred twenty-eight thousand, six hundred fifty-four".