84779777 has 2 divisors, whose sum is σ = 84779778. Its totient is φ = 84779776.

The previous prime is 84779741. The next prime is 84779797. The reversal of 84779777 is 77797748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56911936 + 27867841 = 7544^2 + 5279^2 .

It is a cyclic number.

It is not a de Polignac number, because 84779777 - 2²² = 80585473 is a prime.

It is a super-2 number, since 2×84779777² = 14375221176339458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84779707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42389888 + 42389889.

It is an arithmetic number, because the mean of its divisors is an integer number (42389889).

Almost surely, 2^84779777 is an apocalyptic number.

It is an amenable number.

84779777 is a deficient number, since it is larger than the sum of its proper divisors (1).

84779777 is an equidigital number, since it uses as much as digits as its factorization.

84779777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4840416, while the sum is 56.

The square root of 84779777 is about 9207.5934423714. The cubic root of 84779777 is about 439.3029199786.

The spelling of 84779777 in words is "eighty-four million, seven hundred seventy-nine thousand, seven hundred seventy-seven".