997507500 has 240 divisors, whose sum is σ = 3230865792. Its totient is φ = 237440000.

The previous prime is 997507499. The next prime is 997507501. The reversal of 997507500 is 5705799.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (997507499) and next prime (997507501).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (997507501) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8827444 + ... + 8827556.

Almost surely, 2^997507500 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 997507500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1615432896).

997507500 is an abundant number, since it is smaller than the sum of its proper divisors (2233358292).

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

997507500 is a wasteful number, since it uses less digits than its factorization.

997507500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 99225, while the sum is 42.

The square root of 997507500 is about 31583.3421284069. The cubic root of 997507500 is about 999.1684754252.

The spelling of 997507500 in words is "nine hundred ninety-seven million, five hundred seven thousand, five hundred".