787649 has 2 divisors, whose sum is σ = 787650. Its totient is φ = 787648.

The previous prime is 787639. The next prime is 787667. The reversal of 787649 is 946787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753424 + 34225 = 868^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 787649 - 2¹² = 783553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (787609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393824 + 393825.

It is an arithmetic number, because the mean of its divisors is an integer number (393825).

2⁷⁸⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

787649 is a deficient number, since it is larger than the sum of its proper divisors (1).

787649 is an equidigital number, since it uses as much as digits as its factorization.

787649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 787649 is about 887.4959154836. The cubic root of 787649 is about 92.3515612884.

The spelling of 787649 in words is "seven hundred eighty-seven thousand, six hundred forty-nine".