90478602077 has 2 divisors, whose sum is σ = 90478602078. Its totient is φ = 90478602076.

The previous prime is 90478602041. The next prime is 90478602101. The reversal of 90478602077 is 77020687409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53463150841 + 37015451236 = 231221^2 + 192394^2 .

It is a cyclic number.

It is not a de Polignac number, because 90478602077 - 2⁸ = 90478601821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90478602377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45239301038 + 45239301039.

It is an arithmetic number, because the mean of its divisors is an integer number (45239301039).

Almost surely, 2^90478602077 is an apocalyptic number.

It is an amenable number.

90478602077 is a deficient number, since it is larger than the sum of its proper divisors (1).

90478602077 is an equidigital number, since it uses as much as digits as its factorization.

90478602077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 90478602077 in words is "ninety billion, four hundred seventy-eight million, six hundred two thousand, seventy-seven".