77648508078 has 16 divisors (see below), whose sum is σ = 155347327440. Its totient is φ = 25874450816.

The previous prime is 77648508061. The next prime is 77648508079. The reversal of 77648508078 is 87080584677.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77648508079) 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, 2076225 + ... + 2113292.

It is an arithmetic number, because the mean of its divisors is an integer number (9709207965).

Almost surely, 2^77648508078 is an apocalyptic number.

77648508078 is an abundant number, since it is smaller than the sum of its proper divisors (77698819362).

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

77648508078 is a wasteful number, since it uses less digits than its factorization.

77648508078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192611.

The product of its (nonzero) digits is 21073920, while the sum is 60.

The spelling of 77648508078 in words is "seventy-seven billion, six hundred forty-eight million, five hundred eight thousand, seventy-eight".