19687457344 has 21 divisors (see below), whose sum is σ = 39069525747. Its totient is φ = 9843167424.

The previous prime is 19687457329. The next prime is 19687457357. The reversal of 19687457344 is 44375478691.

It is a happy number.

The square root of 19687457344 is 140312.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1113727 + ... + 1131265.

It is an arithmetic number, because the mean of its divisors is an integer number (1860453607).

Almost surely, 2^19687457344 is an apocalyptic number.

19687457344 is the 140312-nd square number.

It is an amenable number.

19687457344 is a deficient number, since it is larger than the sum of its proper divisors (19382068403).

19687457344 is an frugal number, since it uses more digits than its factorization.

19687457344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35090 (or 17541 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 58.

The spelling of 19687457344 in words is "nineteen billion, six hundred eighty-seven million, four hundred fifty-seven thousand, three hundred forty-four".