788661 has 6 divisors (see below), whose sum is σ = 1139190. Its totient is φ = 525768.

The previous prime is 788659. The next prime is 788677. The reversal of 788661 is 166887.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 324900 = 681^2 + 570^2 .

It is not a de Polignac number, because 788661 - 2¹ = 788659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (788621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43806 + ... + 43823.

It is an arithmetic number, because the mean of its divisors is an integer number (189865).

2⁷⁸⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

788661 is a deficient number, since it is larger than the sum of its proper divisors (350529).

788661 is a wasteful number, since it uses less digits than its factorization.

788661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87635 (or 87632 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 788661 is about 888.0658759349. The cubic root of 788661 is about 92.3910965728.

The spelling of 788661 in words is "seven hundred eighty-eight thousand, six hundred sixty-one".