2678492989 has 2 divisors, whose sum is σ = 2678492990. Its totient is φ = 2678492988.

The previous prime is 2678492939. The next prime is 2678493001. The reversal of 2678492989 is 9892948762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2076624900 + 601868089 = 45570^2 + 24533^2 .

It is a cyclic number.

It is not a de Polignac number, because 2678492989 - 2¹⁵ = 2678460221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2678492989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2678492939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339246494 + 1339246495.

It is an arithmetic number, because the mean of its divisors is an integer number (1339246495).

Almost surely, 2^2678492989 is an apocalyptic number.

It is an amenable number.

2678492989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2678492989 is an equidigital number, since it uses as much as digits as its factorization.

2678492989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 64.

The square root of 2678492989 is about 51754.1591468744. The cubic root of 2678492989 is about 1388.7695041635.

The spelling of 2678492989 in words is "two billion, six hundred seventy-eight million, four hundred ninety-two thousand, nine hundred eighty-nine".