84978653 has 2 divisors, whose sum is σ = 84978654. Its totient is φ = 84978652.

The previous prime is 84978611. The next prime is 84978667. The reversal of 84978653 is 35687948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69939769 + 15038884 = 8363^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 84978653 - 2¹⁶ = 84913117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84978683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42489326 + 42489327.

It is an arithmetic number, because the mean of its divisors is an integer number (42489327).

Almost surely, 2^84978653 is an apocalyptic number.

It is an amenable number.

84978653 is a deficient number, since it is larger than the sum of its proper divisors (1).

84978653 is an equidigital number, since it uses as much as digits as its factorization.

84978653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 84978653 is about 9218.3866809762. The cubic root of 84978653 is about 439.6461566349.

The spelling of 84978653 in words is "eighty-four million, nine hundred seventy-eight thousand, six hundred fifty-three".