998507520 has 352 divisors, whose sum is σ = 3678704640. Its totient is φ = 256573440.

The previous prime is 998507507. The next prime is 998507537. The reversal of 998507520 is 25705899.

It is a happy number.

998507520 is a `hidden beast` number, since 9 + 98 + 507 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 4285324 + ... + 4285556.

Almost surely, 2^998507520 is an apocalyptic number.

998507520 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998507520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1839352320).

998507520 is an abundant number, since it is smaller than the sum of its proper divisors (2680197120).

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

998507520 is a wasteful number, since it uses less digits than its factorization.

998507520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 998507520 is about 31599.1696093426. The cubic root of 998507520 is about 999.5022589616.

The spelling of 998507520 in words is "nine hundred ninety-eight million, five hundred seven thousand, five hundred twenty".