78582641 has 2 divisors, whose sum is σ = 78582642. Its totient is φ = 78582640.

The previous prime is 78582607. The next prime is 78582649. The reversal of 78582641 is 14628587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62742241 + 15840400 = 7921^2 + 3980^2 .

It is an emirp because it is prime and its reverse (14628587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78582641 - 2²² = 74388337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78582649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39291320 + 39291321.

It is an arithmetic number, because the mean of its divisors is an integer number (39291321).

Almost surely, 2^78582641 is an apocalyptic number.

It is an amenable number.

78582641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78582641 is an equidigital number, since it uses as much as digits as its factorization.

78582641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 78582641 is about 8864.6850479868. The cubic root of 78582641 is about 428.3270875089.

The spelling of 78582641 in words is "seventy-eight million, five hundred eighty-two thousand, six hundred forty-one".