78011489 has 2 divisors, whose sum is σ = 78011490. Its totient is φ = 78011488.

The previous prime is 78011477. The next prime is 78011519. The reversal of 78011489 is 98411087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70694464 + 7317025 = 8408^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 78011489 - 2¹² = 78007393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78013489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39005744 + 39005745.

It is an arithmetic number, because the mean of its divisors is an integer number (39005745).

Almost surely, 2^78011489 is an apocalyptic number.

It is an amenable number.

78011489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78011489 is an equidigital number, since it uses as much as digits as its factorization.

78011489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 78011489 is about 8832.4112789204. The cubic root of 78011489 is about 427.2868451636.

The spelling of 78011489 in words is "seventy-eight million, eleven thousand, four hundred eighty-nine".