785021649 has 16 divisors (see below), whose sum is σ = 1082425344. Its totient is φ = 505544400.

The previous prime is 785021623. The next prime is 785021693. The reversal of 785021649 is 946120587.

It is not a de Polignac number, because 785021649 - 2²¹ = 782924497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 785021649.

It is not an unprimeable number, because it can be changed into a prime (785021249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45712 + ... + 60494.

It is an arithmetic number, because the mean of its divisors is an integer number (67651584).

Almost surely, 2^785021649 is an apocalyptic number.

It is an amenable number.

785021649 is a deficient number, since it is larger than the sum of its proper divisors (297403695).

785021649 is a wasteful number, since it uses less digits than its factorization.

785021649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15388.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 785021649 is about 28018.2377925522. The cubic root of 785021649 is about 922.4876158178.

The spelling of 785021649 in words is "seven hundred eighty-five million, twenty-one thousand, six hundred forty-nine".