98778749 has 2 divisors, whose sum is σ = 98778750. Its totient is φ = 98778748.

The previous prime is 98778737. The next prime is 98778773. The reversal of 98778749 is 94787789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53553124 + 45225625 = 7318^2 + 6725^2 .

It is a cyclic number.

It is not a de Polignac number, because 98778749 - 2⁴ = 98778733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98778149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49389374 + 49389375.

It is an arithmetic number, because the mean of its divisors is an integer number (49389375).

Almost surely, 2^98778749 is an apocalyptic number.

It is an amenable number.

98778749 is a deficient number, since it is larger than the sum of its proper divisors (1).

98778749 is an equidigital number, since it uses as much as digits as its factorization.

98778749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 59.

The square root of 98778749 is about 9938.7498710854. The cubic root of 98778749 is about 462.2616238366.

The spelling of 98778749 in words is "ninety-eight million, seven hundred seventy-eight thousand, seven hundred forty-nine".