786728461 has 8 divisors (see below), whose sum is σ = 791252280. Its totient is φ = 782214912.

The previous prime is 786728389. The next prime is 786728471. The reversal of 786728461 is 164827687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1664100 + 785064361 = 1290^2 + 28019^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 786728461 - 2⁷ = 786728333 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 (786728471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191121 + ... + 195193.

It is an arithmetic number, because the mean of its divisors is an integer number (98906535).

Almost surely, 2^786728461 is an apocalyptic number.

It is an amenable number.

786728461 is a deficient number, since it is larger than the sum of its proper divisors (4523819).

786728461 is a wasteful number, since it uses less digits than its factorization.

786728461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135.

The product of its digits is 903168, while the sum is 49.

The square root of 786728461 is about 28048.6802006797. The cubic root of 786728461 is about 923.1556964144.

The spelling of 786728461 in words is "seven hundred eighty-six million, seven hundred twenty-eight thousand, four hundred sixty-one".