990856357078 has 16 divisors (see below), whose sum is σ = 1700808343200. Its totient is φ = 424103363136.

The previous prime is 990856357067. The next prime is 990856357079. The reversal of 990856357078 is 870753658099.

990856357078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990856357079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45768903 + ... + 45790546.

It is an arithmetic number, because the mean of its divisors is an integer number (106300521450).

Almost surely, 2^990856357078 is an apocalyptic number.

990856357078 is a deficient number, since it is larger than the sum of its proper divisors (709951986122).

990856357078 is a wasteful number, since it uses less digits than its factorization.

990856357078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91560231.

The product of its (nonzero) digits is 114307200, while the sum is 67.

The spelling of 990856357078 in words is "nine hundred ninety billion, eight hundred fifty-six million, three hundred fifty-seven thousand, seventy-eight".