78622573 has 2 divisors, whose sum is σ = 78622574. Its totient is φ = 78622572.

The previous prime is 78622571. The next prime is 78622651. The reversal of 78622573 is 37522687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68112009 + 10510564 = 8253^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 78622573 - 2¹ = 78622571 is a prime.

Together with 78622571, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78622571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39311286 + 39311287.

It is an arithmetic number, because the mean of its divisors is an integer number (39311287).

Almost surely, 2^78622573 is an apocalyptic number.

It is an amenable number.

78622573 is a deficient number, since it is larger than the sum of its proper divisors (1).

78622573 is an equidigital number, since it uses as much as digits as its factorization.

78622573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 40.

The square root of 78622573 is about 8866.9370698116. The cubic root of 78622573 is about 428.3996271127.

The spelling of 78622573 in words is "seventy-eight million, six hundred twenty-two thousand, five hundred seventy-three".