78623833 has 2 divisors, whose sum is σ = 78623834. Its totient is φ = 78623832.

The previous prime is 78623819. The next prime is 78623849. The reversal of 78623833 is 33832687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78623689 + 144 = 8867^2 + 12^2 .

It is a cyclic number.

It is not a de Polignac number, because 78623833 - 2⁵ = 78623801 is a prime.

It is a super-2 number, since 2×78623833² = 12363414231223778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78623863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39311916 + 39311917.

It is an arithmetic number, because the mean of its divisors is an integer number (39311917).

Almost surely, 2^78623833 is an apocalyptic number.

It is an amenable number.

78623833 is a deficient number, since it is larger than the sum of its proper divisors (1).

78623833 is an equidigital number, since it uses as much as digits as its factorization.

78623833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 78623833 is about 8867.0081199918. The cubic root of 78623833 is about 428.4019156015.

The spelling of 78623833 in words is "seventy-eight million, six hundred twenty-three thousand, eight hundred thirty-three".