78452761 has 2 divisors, whose sum is σ = 78452762. Its totient is φ = 78452760.

The previous prime is 78452753. The next prime is 78452783. The reversal of 78452761 is 16725487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78428736 + 24025 = 8856^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 78452761 - 2³ = 78452753 is a prime.

It is not a weakly prime, because it can be changed into another prime (78452711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39226380 + 39226381.

It is an arithmetic number, because the mean of its divisors is an integer number (39226381).

Almost surely, 2^78452761 is an apocalyptic number.

It is an amenable number.

78452761 is a deficient number, since it is larger than the sum of its proper divisors (1).

78452761 is an equidigital number, since it uses as much as digits as its factorization.

78452761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 40.

The square root of 78452761 is about 8857.3563211604. The cubic root of 78452761 is about 428.0909802367.

The spelling of 78452761 in words is "seventy-eight million, four hundred fifty-two thousand, seven hundred sixty-one".