77880018 has 16 divisors (see below), whose sum is σ = 155863296. Its totient is φ = 25942800.

The previous prime is 77880013. The next prime is 77880053. The reversal of 77880018 is 81008877.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77880013) 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, 8380 + ... + 15032.

It is an arithmetic number, because the mean of its divisors is an integer number (9741456).

Almost surely, 2^77880018 is an apocalyptic number.

77880018 is an abundant number, since it is smaller than the sum of its proper divisors (77983278).

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

77880018 is a wasteful number, since it uses less digits than its factorization.

77880018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8609.

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 77880018 is about 8824.9656089981. The cubic root of 77880018 is about 427.0466779079.

The spelling of 77880018 in words is "seventy-seven million, eight hundred eighty thousand, eighteen".