78622081 has 2 divisors, whose sum is σ = 78622082. Its totient is φ = 78622080.

The previous prime is 78622079. The next prime is 78622091. The reversal of 78622081 is 18022687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78588225 + 33856 = 8865^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 78622081 - 2¹ = 78622079 is a prime.

It is a super-2 number, since 2×78622081² = 12362863241541122, which contains 22 as substring.

Together with 78622079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78622001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39311040 + 39311041.

It is an arithmetic number, because the mean of its divisors is an integer number (39311041).

Almost surely, 2^78622081 is an apocalyptic number.

It is an amenable number.

78622081 is a deficient number, since it is larger than the sum of its proper divisors (1).

78622081 is an equidigital number, since it uses as much as digits as its factorization.

78622081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 78622081 is about 8866.9093262534. The cubic root of 78622081 is about 428.3987335056.

The spelling of 78622081 in words is "seventy-eight million, six hundred twenty-two thousand, eighty-one".