78030761 has 2 divisors, whose sum is σ = 78030762. Its totient is φ = 78030760.

The previous prime is 78030703. The next prime is 78030769. The reversal of 78030761 is 16703087.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 9803161 = 8260^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 78030761 - 2¹⁸ = 77768617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78030769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39015380 + 39015381.

It is an arithmetic number, because the mean of its divisors is an integer number (39015381).

Almost surely, 2^78030761 is an apocalyptic number.

It is an amenable number.

78030761 is a deficient number, since it is larger than the sum of its proper divisors (1).

78030761 is an equidigital number, since it uses as much as digits as its factorization.

78030761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 78030761 is about 8833.5021933546. The cubic root of 78030761 is about 427.3220279903.

The spelling of 78030761 in words is "seventy-eight million, thirty thousand, seven hundred sixty-one".