77697678 has 16 divisors (see below), whose sum is σ = 155805696. Its totient is φ = 25830840.

The previous prime is 77697671. The next prime is 77697727. The reversal of 77697678 is 87679677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77697671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14608 + ... + 19203.

It is an arithmetic number, because the mean of its divisors is an integer number (9737856).

Almost surely, 2^77697678 is an apocalyptic number.

77697678 is an abundant number, since it is smaller than the sum of its proper divisors (78108018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77697678 is a wasteful number, since it uses less digits than its factorization.

77697678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34199.

The product of its digits is 6223392, while the sum is 57.

The square root of 77697678 is about 8814.6286365337. The cubic root of 77697678 is about 426.7131368927.

The spelling of 77697678 in words is "seventy-seven million, six hundred ninety-seven thousand, six hundred seventy-eight".