87777413 has 2 divisors, whose sum is σ = 87777414. Its totient is φ = 87777412.

The previous prime is 87777331. The next prime is 87777419. The reversal of 87777413 is 31477778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66552964 + 21224449 = 8158^2 + 4607^2 .

It is a cyclic number.

It is not a de Polignac number, because 87777413 - 2¹² = 87773317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87777419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43888706 + 43888707.

It is an arithmetic number, because the mean of its divisors is an integer number (43888707).

Almost surely, 2^87777413 is an apocalyptic number.

It is an amenable number.

87777413 is a deficient number, since it is larger than the sum of its proper divisors (1).

87777413 is an equidigital number, since it uses as much as digits as its factorization.

87777413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230496, while the sum is 44.

The square root of 87777413 is about 9368.9600810335. The cubic root of 87777413 is about 444.4206794631.

The spelling of 87777413 in words is "eighty-seven million, seven hundred seventy-seven thousand, four hundred thirteen".