78722687 has 2 divisors, whose sum is σ = 78722688. Its totient is φ = 78722686.

The previous prime is 78722663. The next prime is 78722731. The reversal of 78722687 is 78622787.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78622787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78722687 - 2²² = 74528383 is a prime.

It is a super-2 number, since 2×78722687² = 12394522896999938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78722627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39361343 + 39361344.

It is an arithmetic number, because the mean of its divisors is an integer number (39361344).

Almost surely, 2^78722687 is an apocalyptic number.

78722687 is a deficient number, since it is larger than the sum of its proper divisors (1).

78722687 is an equidigital number, since it uses as much as digits as its factorization.

78722687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 47.

The square root of 78722687 is about 8872.5806279797. The cubic root of 78722687 is about 428.5813841127.

The spelling of 78722687 in words is "seventy-eight million, seven hundred twenty-two thousand, six hundred eighty-seven".