998591520 has 192 divisors, whose sum is σ = 3288781440. Its totient is φ = 254435328.

The previous prime is 998591519. The next prime is 998591549. The reversal of 998591520 is 25195899.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 998591520.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1047364 + ... + 1048316.

It is an arithmetic number, because the mean of its divisors is an integer number (17129070).

Almost surely, 2^998591520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998591520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1644390720).

998591520 is an abundant number, since it is smaller than the sum of its proper divisors (2290189920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998591520 is a wasteful number, since it uses less digits than its factorization.

998591520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 48.

The square root of 998591520 is about 31600.4987302416. The cubic root of 998591520 is about 999.5302860700.

The spelling of 998591520 in words is "nine hundred ninety-eight million, five hundred ninety-one thousand, five hundred twenty".