1597489664 has 40 divisors (see below), whose sum is σ = 3246019920. Its totient is φ = 785191936.

The previous prime is 1597489639. The next prime is 1597489667. The reversal of 1597489664 is 4669847951.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (1597489667) 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, 3767 + ... + 56649.

It is an arithmetic number, because the mean of its divisors is an integer number (81150498).

Almost surely, 2^1597489664 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 1597489664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1623009960).

1597489664 is an abundant number, since it is smaller than the sum of its proper divisors (1648530256).

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

1597489664 is an frugal number, since it uses more digits than its factorization.

1597489664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52960 (or 52944 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 59.

The square root of 1597489664 is about 39968.6084821576. The cubic root of 1597489664 is about 1168.9950861848.

The spelling of 1597489664 in words is "one billion, five hundred ninety-seven million, four hundred eighty-nine thousand, six hundred sixty-four".