1587645997 has 24 divisors (see below), whose sum is σ = 1985300928. Its totient is φ = 1239384960.

The previous prime is 1587645989. The next prime is 1587646007. The reversal of 1587645997 is 7995467851.

It is not a de Polignac number, because 1587645997 - 2³ = 1587645989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1587645797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107418 + ... + 121300.

It is an arithmetic number, because the mean of its divisors is an integer number (82720872).

Almost surely, 2^1587645997 is an apocalyptic number.

1587645997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1587645997 is a deficient number, since it is larger than the sum of its proper divisors (397654931).

1587645997 is a wasteful number, since it uses less digits than its factorization.

1587645997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13969 (or 13938 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 61.

The square root of 1587645997 is about 39845.2757174549. The cubic root of 1587645997 is about 1166.5890371839.

The spelling of 1587645997 in words is "one billion, five hundred eighty-seven million, six hundred forty-five thousand, nine hundred ninety-seven".