78861667 has 2 divisors, whose sum is σ = 78861668. Its totient is φ = 78861666.

The previous prime is 78861659. The next prime is 78861697. The reversal of 78861667 is 76616887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78861667 - 2³ = 78861659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78861667.

It is not a weakly prime, because it can be changed into another prime (78861697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39430833 + 39430834.

It is an arithmetic number, because the mean of its divisors is an integer number (39430834).

Almost surely, 2^78861667 is an apocalyptic number.

78861667 is a deficient number, since it is larger than the sum of its proper divisors (1).

78861667 is an equidigital number, since it uses as much as digits as its factorization.

78861667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The square root of 78861667 is about 8880.4091685012. The cubic root of 78861667 is about 428.8334470823.

The spelling of 78861667 in words is "seventy-eight million, eight hundred sixty-one thousand, six hundred sixty-seven".