77989867 has 2 divisors, whose sum is σ = 77989868. Its totient is φ = 77989866.

The previous prime is 77989859. The next prime is 77989883. The reversal of 77989867 is 76898977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77989867 - 2³ = 77989859 is a prime.

It is not a weakly prime, because it can be changed into another prime (77989817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38994933 + 38994934.

It is an arithmetic number, because the mean of its divisors is an integer number (38994934).

Almost surely, 2^77989867 is an apocalyptic number.

77989867 is a deficient number, since it is larger than the sum of its proper divisors (1).

77989867 is an equidigital number, since it uses as much as digits as its factorization.

77989867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 61.

The square root of 77989867 is about 8831.1871795359. The cubic root of 77989867 is about 427.2473652957.

The spelling of 77989867 in words is "seventy-seven million, nine hundred eighty-nine thousand, eight hundred sixty-seven".