77065978 has 16 divisors (see below), whose sum is σ = 129185280. Its totient is φ = 34175200.

The previous prime is 77065949. The next prime is 77065979. The reversal of 77065978 is 87956077.

It is not an unprimeable number, because it can be changed into a prime (77065979) 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, 41818 + ... + 43621.

It is an arithmetic number, because the mean of its divisors is an integer number (8074080).

Almost surely, 2^77065978 is an apocalyptic number.

77065978 is a deficient number, since it is larger than the sum of its proper divisors (52119302).

77065978 is a wasteful number, since it uses less digits than its factorization.

77065978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85493.

The product of its (nonzero) digits is 740880, while the sum is 49.

The square root of 77065978 is about 8778.7230278669. The cubic root of 77065978 is about 425.5535633294.

The spelling of 77065978 in words is "seventy-seven million, sixty-five thousand, nine hundred seventy-eight".