78822631 has 2 divisors, whose sum is σ = 78822632. Its totient is φ = 78822630.

The previous prime is 78822599. The next prime is 78822647. The reversal of 78822631 is 13622887.

It is a strong prime.

It is an emirp because it is prime and its reverse (13622887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78822631 - 2⁵ = 78822599 is a prime.

It is a super-2 number, since 2×78822631² = 12426014315524322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78822661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39411315 + 39411316.

It is an arithmetic number, because the mean of its divisors is an integer number (39411316).

Almost surely, 2^78822631 is an apocalyptic number.

78822631 is a deficient number, since it is larger than the sum of its proper divisors (1).

78822631 is an equidigital number, since it uses as much as digits as its factorization.

78822631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 78822631 is about 8878.2110247504. The cubic root of 78822631 is about 428.7626788375.

The spelling of 78822631 in words is "seventy-eight million, eight hundred twenty-two thousand, six hundred thirty-one".