77868945 has 120 divisors (see below), whose sum is σ = 176121792. Its totient is φ = 32218560.

The previous prime is 77868943. The next prime is 77868949. The reversal of 77868945 is 54986877.

It is not a de Polignac number, because 77868945 - 2¹ = 77868943 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77868891 and 77868900.

It is not an unprimeable number, because it can be changed into a prime (77868943) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 342922 + ... + 343148.

Almost surely, 2^77868945 is an apocalyptic number.

It is an amenable number.

77868945 is an abundant number, since it is smaller than the sum of its proper divisors (98252847).

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

77868945 is a wasteful number, since it uses less digits than its factorization.

77868945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 253 counting only the distinct ones).

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

The square root of 77868945 is about 8824.3382188128. The cubic root of 77868945 is about 427.0264377483.

The spelling of 77868945 in words is "seventy-seven million, eight hundred sixty-eight thousand, nine hundred forty-five".