77948685 has 12 divisors (see below), whose sum is σ = 135111132. Its totient is φ = 41572608.

The previous prime is 77948683. The next prime is 77948687. The reversal of 77948685 is 58684977.

It is an interprime number because it is at equal distance from previous prime (77948683) and next prime (77948687).

It can be written as a sum of positive squares in 2 ways, for example, as 36036009 + 41912676 = 6003^2 + 6474^2 .

It is not a de Polignac number, because 77948685 - 2¹ = 77948683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77948681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 866052 + ... + 866141.

It is an arithmetic number, because the mean of its divisors is an integer number (11259261).

Almost surely, 2^77948685 is an apocalyptic number.

It is an amenable number.

77948685 is a deficient number, since it is larger than the sum of its proper divisors (57162447).

77948685 is a wasteful number, since it uses less digits than its factorization.

77948685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732204 (or 1732201 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 77948685 is about 8828.8552485586. The cubic root of 77948685 is about 427.1721504012.

The spelling of 77948685 in words is "seventy-seven million, nine hundred forty-eight thousand, six hundred eighty-five".