90207765 has 24 divisors (see below), whose sum is σ = 159999840. Its totient is φ = 46990944.

The previous prime is 90207751. The next prime is 90207773. The reversal of 90207765 is 56770209.

It is not a de Polignac number, because 90207765 - 2¹⁰ = 90206741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21375 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (6666660).

Almost surely, 2^90207765 is an apocalyptic number.

It is an amenable number.

90207765 is a deficient number, since it is larger than the sum of its proper divisors (69792075).

90207765 is a wasteful number, since it uses less digits than its factorization.

90207765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46673 (or 46670 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 90207765 is about 9497.7768451359. The cubic root of 90207765 is about 448.4850537332.

The spelling of 90207765 in words is "ninety million, two hundred seven thousand, seven hundred sixty-five".