90565780 has 24 divisors (see below), whose sum is σ = 200198880. Its totient is φ = 34319520.

The previous prime is 90565729. The next prime is 90565781. The reversal of 90565780 is 8756509.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90565781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118786 + ... + 119545.

It is an arithmetic number, because the mean of its divisors is an integer number (8341620).

Almost surely, 2^90565780 is an apocalyptic number.

It is an amenable number.

90565780 is an abundant number, since it is smaller than the sum of its proper divisors (109633100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90565780 is a wasteful number, since it uses less digits than its factorization.

90565780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238359 (or 238357 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 90565780 is about 9516.6054872523. The cubic root of 90565780 is about 449.0775837614.

The spelling of 90565780 in words is "ninety million, five hundred sixty-five thousand, seven hundred eighty".