78599641 has 2 divisors, whose sum is σ = 78599642. Its totient is φ = 78599640.

The previous prime is 78599639. The next prime is 78599669. The reversal of 78599641 is 14699587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44622400 + 33977241 = 6680^2 + 5829^2 .

It is a cyclic number.

It is not a de Polignac number, because 78599641 - 2¹ = 78599639 is a prime.

Together with 78599639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78599681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39299820 + 39299821.

It is an arithmetic number, because the mean of its divisors is an integer number (39299821).

Almost surely, 2^78599641 is an apocalyptic number.

It is an amenable number.

78599641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78599641 is an equidigital number, since it uses as much as digits as its factorization.

78599641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 78599641 is about 8865.6438570473. The cubic root of 78599641 is about 428.3579723429.

The spelling of 78599641 in words is "seventy-eight million, five hundred ninety-nine thousand, six hundred forty-one".