78294661 has 2 divisors, whose sum is σ = 78294662. Its totient is φ = 78294660.

The previous prime is 78294653. The next prime is 78294683. The reversal of 78294661 is 16649287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51926436 + 26368225 = 7206^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 78294661 - 2³ = 78294653 is a prime.

It is a super-2 number, since 2×78294661² = 12260107882209842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78294761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39147330 + 39147331.

It is an arithmetic number, because the mean of its divisors is an integer number (39147331).

Almost surely, 2^78294661 is an apocalyptic number.

It is an amenable number.

78294661 is a deficient number, since it is larger than the sum of its proper divisors (1).

78294661 is an equidigital number, since it uses as much as digits as its factorization.

78294661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 78294661 is about 8848.4270353549. The cubic root of 78294661 is about 427.8032202380.

The spelling of 78294661 in words is "seventy-eight million, two hundred ninety-four thousand, six hundred sixty-one".