78706091649 has 32 divisors (see below), whose sum is σ = 111815147520. Its totient is φ = 49073696000.

The previous prime is 78706091599. The next prime is 78706091671. The reversal of 78706091649 is 94619060787.

It is not a de Polignac number, because 78706091649 - 2⁹ = 78706091137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78706091689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5978224 + ... + 5991374.

It is an arithmetic number, because the mean of its divisors is an integer number (3494223360).

Almost surely, 2^78706091649 is an apocalyptic number.

It is an amenable number.

78706091649 is a deficient number, since it is larger than the sum of its proper divisors (33109055871).

78706091649 is a wasteful number, since it uses less digits than its factorization.

78706091649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13901.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The spelling of 78706091649 in words is "seventy-eight billion, seven hundred six million, ninety-one thousand, six hundred forty-nine".