990478558 has 8 divisors (see below), whose sum is σ = 1487068128. Its totient is φ = 494789184.

The previous prime is 990478553. The next prime is 990478639. The reversal of 990478558 is 855874099.

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

It is a junction number, because it is equal to n+sod(n) for n = 990478499 and 990478508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990478553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222291 + ... + 226702.

It is an arithmetic number, because the mean of its divisors is an integer number (185883516).

Almost surely, 2^990478558 is an apocalyptic number.

990478558 is a deficient number, since it is larger than the sum of its proper divisors (496589570).

990478558 is a wasteful number, since it uses less digits than its factorization.

990478558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450098.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 990478558 is about 31471.8693121333. The cubic root of 990478558 is about 996.8160592805.

The spelling of 990478558 in words is "nine hundred ninety million, four hundred seventy-eight thousand, five hundred fifty-eight".