78867361 has 2 divisors, whose sum is σ = 78867362. Its totient is φ = 78867360.

The previous prime is 78867353. The next prime is 78867377. The reversal of 78867361 is 16376887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39929761 + 38937600 = 6319^2 + 6240^2 .

It is a cyclic number.

It is not a de Polignac number, because 78867361 - 2³ = 78867353 is a prime.

It is a super-2 number, since 2×78867361² = 12440121262208642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78867331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39433680 + 39433681.

It is an arithmetic number, because the mean of its divisors is an integer number (39433681).

Almost surely, 2^78867361 is an apocalyptic number.

It is an amenable number.

78867361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78867361 is an equidigital number, since it uses as much as digits as its factorization.

78867361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 78867361 is about 8880.7297560505. The cubic root of 78867361 is about 428.8437677656.

The spelling of 78867361 in words is "seventy-eight million, eight hundred sixty-seven thousand, three hundred sixty-one".