90577765 has 4 divisors (see below), whose sum is σ = 108693324. Its totient is φ = 72462208.

The previous prime is 90577763. The next prime is 90577777. The reversal of 90577765 is 56777509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56777509 = 127 ⋅447067.

It can be written as a sum of positive squares in 2 ways, for example, as 15634116 + 74943649 = 3954^2 + 8657^2 .

It is a cyclic number.

It is not a de Polignac number, because 90577765 - 2¹ = 90577763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90577763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9057772 + ... + 9057781.

It is an arithmetic number, because the mean of its divisors is an integer number (27173331).

Almost surely, 2^90577765 is an apocalyptic number.

It is an amenable number.

90577765 is a deficient number, since it is larger than the sum of its proper divisors (18115559).

90577765 is a wasteful number, since it uses less digits than its factorization.

90577765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18115558.

The product of its (nonzero) digits is 463050, while the sum is 46.

The square root of 90577765 is about 9517.2351552328. The cubic root of 90577765 is about 449.0973924111.

The spelling of 90577765 in words is "ninety million, five hundred seventy-seven thousand, seven hundred sixty-five".