90657785 has 4 divisors (see below), whose sum is σ = 108789348. Its totient is φ = 72526224.

The previous prime is 90657781. The next prime is 90657839. The reversal of 90657785 is 58775609.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58775609 = 4283 ⋅13723.

It can be written as a sum of positive squares in 2 ways, for example, as 66765241 + 23892544 = 8171^2 + 4888^2 .

It is a cyclic number.

It is not a de Polignac number, because 90657785 - 2² = 90657781 is a prime.

It is a super-2 number, since 2×90657785² = 16437667962212450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90657781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9065774 + ... + 9065783.

It is an arithmetic number, because the mean of its divisors is an integer number (27197337).

Almost surely, 2^90657785 is an apocalyptic number.

It is an amenable number.

90657785 is a deficient number, since it is larger than the sum of its proper divisors (18131563).

90657785 is a wasteful number, since it uses less digits than its factorization.

90657785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18131562.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 90657785 is about 9521.4381791828. The cubic root of 90657785 is about 449.2296036511.

The spelling of 90657785 in words is "ninety million, six hundred fifty-seven thousand, seven hundred eighty-five".