90415777 has 2 divisors, whose sum is σ = 90415778. Its totient is φ = 90415776.

The previous prime is 90415757. The next prime is 90415781. The reversal of 90415777 is 77751409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 18352656 = 8489^2 + 4284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90415777 is a prime.

It is not a weakly prime, because it can be changed into another prime (90415727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45207888 + 45207889.

It is an arithmetic number, because the mean of its divisors is an integer number (45207889).

Almost surely, 2^90415777 is an apocalyptic number.

It is an amenable number.

90415777 is a deficient number, since it is larger than the sum of its proper divisors (1).

90415777 is an equidigital number, since it uses as much as digits as its factorization.

90415777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61740, while the sum is 40.

The square root of 90415777 is about 9508.7211022303. The cubic root of 90415777 is about 448.8295128384.

The spelling of 90415777 in words is "ninety million, four hundred fifteen thousand, seven hundred seventy-seven".