78598621 has 2 divisors, whose sum is σ = 78598622. Its totient is φ = 78598620.

The previous prime is 78598607. The next prime is 78598657. The reversal of 78598621 is 12689587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 912025 = 8814^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 78598621 - 2⁷ = 78598493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78598921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39299310 + 39299311.

It is an arithmetic number, because the mean of its divisors is an integer number (39299311).

Almost surely, 2^78598621 is an apocalyptic number.

It is an amenable number.

78598621 is a deficient number, since it is larger than the sum of its proper divisors (1).

78598621 is an equidigital number, since it uses as much as digits as its factorization.

78598621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 78598621 is about 8865.5863314278. The cubic root of 78598621 is about 428.3561193784.

The spelling of 78598621 in words is "seventy-eight million, five hundred ninety-eight thousand, six hundred twenty-one".