78599281 has 2 divisors, whose sum is σ = 78599282. Its totient is φ = 78599280.

The previous prime is 78599267. The next prime is 78599299. The reversal of 78599281 is 18299587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59598400 + 19000881 = 7720^2 + 4359^2 .

It is a cyclic number.

It is not a de Polignac number, because 78599281 - 2¹⁹ = 78074993 is a prime.

It is a super-2 number, since 2×78599281² = 12355693947433922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78599221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39299640 + 39299641.

It is an arithmetic number, because the mean of its divisors is an integer number (39299641).

Almost surely, 2^78599281 is an apocalyptic number.

It is an amenable number.

78599281 is a deficient number, since it is larger than the sum of its proper divisors (1).

78599281 is an equidigital number, since it uses as much as digits as its factorization.

78599281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 78599281 is about 8865.6235539301. The cubic root of 78599281 is about 428.3573183573.

The spelling of 78599281 in words is "seventy-eight million, five hundred ninety-nine thousand, two hundred eighty-one".