84879649 has 2 divisors, whose sum is σ = 84879650. Its totient is φ = 84879648.

The previous prime is 84879629. The next prime is 84879673. The reversal of 84879649 is 94697848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63489024 + 21390625 = 7968^2 + 4625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84879649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84879649.

It is not a weakly prime, because it can be changed into another prime (84879629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42439824 + 42439825.

It is an arithmetic number, because the mean of its divisors is an integer number (42439825).

Almost surely, 2^84879649 is an apocalyptic number.

It is an amenable number.

84879649 is a deficient number, since it is larger than the sum of its proper divisors (1).

84879649 is an equidigital number, since it uses as much as digits as its factorization.

84879649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 84879649 is about 9213.0151959063. The cubic root of 84879649 is about 439.4753543567.

The spelling of 84879649 in words is "eighty-four million, eight hundred seventy-nine thousand, six hundred forty-nine".