787643 has 4 divisors (see below), whose sum is σ = 790728. Its totient is φ = 784560.

The previous prime is 787639. The next prime is 787649. The reversal of 787643 is 346787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 787643 - 2² = 787639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (787649) 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, 1121 + ... + 1682.

It is an arithmetic number, because the mean of its divisors is an integer number (197682).

2⁷⁸⁷⁶⁴³ is an apocalyptic number.

787643 is a deficient number, since it is larger than the sum of its proper divisors (3085).

787643 is a wasteful number, since it uses less digits than its factorization.

787643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084.

The product of its digits is 28224, while the sum is 35.

The square root of 787643 is about 887.4925351799. The cubic root of 787643 is about 92.3513267885.

The spelling of 787643 in words is "seven hundred eighty-seven thousand, six hundred forty-three".