997507572 has 96 divisors (see below), whose sum is σ = 2525644800. Its totient is φ = 305260032.

The previous prime is 997507571. The next prime is 997507597. The reversal of 997507572 is 275705799.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997507571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2154213 + ... + 2154675.

It is an arithmetic number, because the mean of its divisors is an integer number (26308800).

Almost surely, 2^997507572 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 997507572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1262822400).

997507572 is an abundant number, since it is smaller than the sum of its proper divisors (1528137228).

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

997507572 is a wasteful number, since it uses less digits than its factorization.

997507572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 1389150, while the sum is 51.

The square root of 997507572 is about 31583.3432682482. The cubic root of 997507572 is about 999.1684994652.

The spelling of 997507572 in words is "nine hundred ninety-seven million, five hundred seven thousand, five hundred seventy-two".